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Anais da Academia Brasileira de Ciências

Print version ISSN 0001-3765

An. Acad. Bras. Ciênc. vol.80 no.1 Rio de
Janeiro Mar. 2008

doi: 10.1590/S0001-37652008000100006

BIOLOGICAL SCIENCES

Amazon Forest maintenance as a
source of environmental services

Philip M. Fearnside

Instituto Nacional de Pesquisas da Amazônia (INPA),
Caixa Postal 478, 69011-970 Manaus, AM, Brasil

Correspondence
to

ABSTRACT

Amazonian forest produces environmental services
such as maintenance of biodiversity, water cycling and carbon stocks. These
services have a much greater value to human society than do the timber, beef and
other products that are obtained by destroying the forest. Yet institutional
mechanisms are still lacking to transform the value of the standing forest into
the foundation of an economy based on maintaining rather than destroying this
ecosystem. Forest management for commodities such as timber and non-timber
forest products faces severe limitations and inherent contradictions unless
income is supplemented based on environmenta lservices. Amazon forest is
threatened by deforestation, logging, forest fires and climate change. Measures
to avoid deforestation include repression through command and control, creation
of protected areas, and reformulation of infrastructure decisions and
development policies. An economy primarily based on the value of environmental
services is essential for long-term maintenance of the forest. Much progress has
been made in the decades since I first proposed such a transition, but many
issues also remain unresolved. These include theoretical issues regarding
accounting procedures, improved quantification of the services and of the
benefits of different policy options, and effective uses of the funds generated
in ways that maintain both the forest and the human population.

Key words: Amazonia, avoided deforestation,
Brazil, carbon, deforestation, global warming, Greenhouse effect,
rainforest.

RESUMO

A floresta amazônica produz serviços ambientais,
tais como a manutenção da biodiversidade, da ciclagem de água e dos estoques de
carbono. Estes serviços têm um valor muito maior para a sociedade humana do que
a madeira, carne bovina e outros produtos que são obtidos destruindo a floresta.
Mecanismos institucionais ainda estão faltando para transformar o valor da
floresta em pé no alicerce de uma economia baseada em manter, em lugar de
destruir, este ecossistema. Manejo florestal para madeira e para produtos
florestais não-madeireiros enfrenta limitações severas e contradições inerentes
a menos que a renda seja completada com base em serviços ambientais. A floresta
amazônica é ameaçada por desmatamento, exploração madeireira, incêndios
florestais e mudança climática. Medidas para evitar o desmatamento incluem
repressão por comando e controle, criação de áreas protegidas, e reformulação de
decisões sobre infra-estrutura e sobre políticas de desenvolvimento. Uma
economia que é principalmente baseada no valor dos serviços ambientais é
essencial para a manutenção a longo prazo da floresta. Muito progresso foi feito
nas décadas desde que eu propus uma transição deste tipo, mas vários assuntos
também permanecem não resolvidos. Estes incluem assuntos teóricos relativos aos
procedimentos de contabilidade, quantificação melhorada dos serviços e dos
benefícios de diferentes opções de política, e usos eficazes dos fundos gerados
de modo que mantêm tanto a floresta como a população humana.

Palavras-chave: Amazônia, aquecimento
global, carbono, desmatamento evitado, efeito estufa, floresta tropical.

INTRODUCTION

AMAZONIAS PRESENT ECONOMY

The present economy of Brazilian Amazonia is almost
entirely based on destroying the forest, either through predatory logging or
deforestation for cattle pasture and, in some parts of the region, for soybeans.
Sustainable activities such as rubber tapping and Brazilnut harvesting exist,
but their relative importance is minimal from the standpoint of financial flows
in today's economy. In addition, the rate at which these uses can produce
products sustainably is limited and often compares unfavorably with predatory
uses, unless, that is, the value of environmental services can be incorporated
into the income stream.

BARRIERS TO FOREST MANAGEMENT FOR CONVENTIONAL
COMMODITIES

Timber

Forest management for timber faces the
contradictionbetween the slow growth rates of tropical-forest trees and the
financial logic of investors who, whether explicitly calculated or not, act on
the basis of commercial discount rates that reflect the returns that can be
obtained on competing investments elsewhere in the economy (e.g., Fearnside
1979). Forest-management proponents tend to promise anything when a proposal is
evaluated and licensed, but decades later when the first cycle of harvesting is
complete the inherent contradictions must be faced and resolved if management is
to continue in a sustainable way (Fearnside 2003a). In the first harvest cycle,
large trees are being cut that have grown "for free'' over centuries prior to
the initiation of management. This is inherently more profitable than subsequent
cycles when harvesting approaches an equilibrium after which the manager only
harvests what has grown while the sustainable management operation has been
waiting and investing in the trees. This transition represents a discontinuity
with a risk of the land owner or manager abandoning the management plan in favor
of either a predatory harvest or outright deforestation.

Forest management has additional impediments to
sustainability when the managers are small or medium in size - a problem for
which both environmental and social implications are negative. A large firm can,
if it chooses, foresee the end of a resource it is exploiting unsustainably and
prepare a transition to some other resource. A few of the major oil companies,
for example, are beginning to reposition themselves as energy suppliers in a
general sense and are looking for ways to shift their investments to sources
other than oil. By contrast, Amazonian sawmill owners (who are usually
relatively small-scale Brazilian entrepreneurs, not large multinational
corporations) are not likely to switch to something else before the resource
they are exploiting comes to an end. In fact, many have passed through a
sequence of moves, destroying the forest resource first in the Atlantic-forest
states of Espirito Santo or Paraná, then Amazonian forest in northern Mato
Grosso and now in either southern Pará or in Rondônia. Within these Amazonian
states, logging operations have often made a succession of moves from one
frontier to the next. This gives reason to doubt the expectation that these
sawmill operators will become converted to sustainable forest management, taking
only the relatively modest harvests that can be cut without jeopardizing the
system's sustainability.

Non-timber forest products

In the case of non-timber forest products (NTFPs),
such as rubber and Brazil nuts, problems include inherent disadvantages of
extractive systems as compared to plantations and the limits imposed by market
saturation for many products if exploitation were scaled up to the areas
available for management in Amazonia. Additionally, more prosaic temptations are
ever present to increase the intensity of harvesting beyond sustainable limits,
to increase the population beyond what can be supported by the resources at
hand, and to increase areas of clearing for agriculture and pasture within the
extractive areas, obviously at the expense of forest.

PROPOSAL FOR ENVIRONMENTAL SERVICES

This author first proposed environmental services
in 1985 as an adjunct to otherwise-unattractive plans for managing forest for
timber (Fearnside 1985, 1989a) and non-timber forest products (Fearnside 1989b).
Environmental services were grouped into three categories: biodiversity
(Fearnside 1999a), water (Fearnside 2004), and avoiding global warming
(Fearnside 1997a, 2000a, b). The hallmark of the proposal was its aim of tapping
willingness to pay, as opposed to valuation of replacement costs or other
indicators that serve as general illustrations of the fact that human societies
depend on natural ecosystems. One should note the difference with the concept of
"ecosystem services'' (Costanza et al. 1997, 1998, Mooney and Ehrlich 1997,
Pimentel et al. 1997, Daily et al. 2000), which was widely discussed at about
the same time. The original ecosystem-services concept was a heuristic device,
for example calculating a global total value of ecosystem services including
polination by insects and provision of scenic beauty at US$33 trillion, but no
intention of such a sum ever being collected by service providers (Costanza et
al. 1997). Discussion of ecosystem services has since evolved to focus on
"payments for ecosystem services'' (also "Payments for Environmental Services'')
(PES) programs where governments (usually local or national) pay landholders a
stipend for such services as watershed maintenance. A wide variety of studies
and conservation projects have derived from this. Most PES programs, such as
those in Costa Rica and Mexico, reward watershed functions, but some also
include carbon (Grieg-Gran et al. 2005, Karaousakis 2007).

During the Eco-92 or "Earth Summit'' in Rio de
Janeiro in 1992 my proposal for monetary flows based on environmental services
evolved into a broader plan to shift the basis of the economy that supports
Amazonia's rural population, replacing the current destructive pattern
(Fearnside 1997b). International negotiations have progressed the farthest in
the case of compensating the forest's role in avoiding global warming, but the
other services are no less important. In fact, it is the co-benefits of
maintaining biodiversity and water, in addition to indigenous peoples and other
traditional human inhabitants of the forest, which most clearly sets Amazonian
conservation apart from other greenhouse mitigation options such as planting
Eucalyptus (e.g., Fearnside 1999b). Geopolitical concerns resulted in the
avoidance of tropical deforestation being excluded from receiving carbon credit
in the period through 2012, but important parts of these concerns do not apply
to negotiations currently underway for the period from 2013 onwards,making
inclusion of this environmental service likely (Fearnside 2001a, 2006a).

AVOIDING GLOBAL WARMING AS AN ENVIRONMENTAL
SERVICE

Half of the dry weight of the trees is carbon, and
this, together with part of the carbon in the soil under the forest, is released
as carbon dioxide (CO2) or as methane (CH4) when the
forest is cleared. Only a relatively small amount is recaptured by the pasture
and secondary forests that subsequently occupy the landscape. Amazonia as a
whole, including all countries and forest carbon stocks (not only above-ground
live biomass, but also the roots, dead trees and soil stocks) has around 100 Gt
(gigatons = billion tons) of carbon that could be released (e.g., Fearnside
2000a). If this enters the atmosphere it would result in a very substantial
increase in atmospheric CO2 concentration and global temperatures.
Since many global climate models do not include this emission, these increases
would be in addition to the already catastrophic increases indicated by the
models as a result of fossil-fuel emissions under the A2 (= business-as-usual)
scenario of the Intergovernmental Panel on Climate Change (IPCC). This is the
multi-model average of 4°C increase by 2100 over pre-industrial
temperatures indicated by the IPCC's Fourth Assessment Report (IPCC 2007). It
should also be noted that global mean temperature is dominated by temperatures
over the oceans that occupy most of the Earth's surface, and average
temperatures over the continents would be about 30% higher than the global mean.
In the case of Amazonia the possibility of a "permanent El Niño'' being
established could mean even higher temperatures (Cox et al. 2004). In addition,
the model runs used to generate the IPCC estimates (i.e., 4°C mean
global increase by 2100) do not include warming from the emissions released by
biosphere feedbacks, especially the large release of carbon that would occur if
the Amazon forest succumbs to climate change. If included, biosphere feedbacks
increase the predicted temperature in 2100 by 38% (Cox et al. 2004, p. 138).

If the possibility is taken into account of the
global climate reacting to increased atmospheric CO2 more sharply
than the increase corresponding to a 50% probability (i.e., under "high climate
sensitivity,'' or a degree of security corresponding to a 95% probability), then
the temperature could shoot up to much higher levels in Amazonia (e.g.,
Stainforth et al. 2005). The precautionary principle would indicate that these
higher potential temperature increases should be considered in policy making,
underscoring the importance of immediate actions to reduce global emissions of
greenhouse gases, including those from Amazonian deforestation. A recent
reanalysis of climatic sensitivity based on paleoclimatic evidence revised the
estimate of ''high climate sensitivity,'' or the point where there is 95%
certainty that the true climate sensitivity is included, reducing it from 9.7 to
6.2°C (Hegerl et al. 2006).

Amazonia's stock of carbon could enter the
atmosphere in two ways:

1) emissions from deliberate destruction of the
forest by deforestation and by degradation through logging, and

2) emissions that are not made deliberately, as
where forest is degraded due to climate change and by forest fires.

In the case of deliberate emission through
deforestation, protected areas can have both short- and long-term effects. On
the short term, creation of a reserve can cause a dramatic reduction in clearing
by grileiros (large illegal claimants who occupy public land and obtain
titles through fraud and corruption). The existence of a reserve greatly reduces
the chance of grileiros or other invaders eventually gaining legal title,
and therefore reduces the motive for clearing. Some of this activity can simply
move to other locations (an effect known as "leakage'' in the carbon
literature), but some of the reduction is a net gain. Reserves have a measurable
effect in decreasing deforestation (Ferreira et al. 2005, Nepstad et al. 2006).
In addition, the placement of reserves can act as a barrier inhibiting the
advance of deforestation into areas beyond the reserve itself (Fearnside 2003a).

Degradation from climate change and fire can affect
the entire forest, including that within protected areas. In addition to their
role in slowing global warming by avoiding carbon emissions, reserves contribute
to reducing degradation by maintaining the water-cycling functions of the
forest. Because much of the rainfall in Amazonia is water that has been recycled
through the forest, especially in the critically important dry season, keeping
substantial blocks of forest in reserves maintains the climatic conditions
needed to maintain forest in the remainder of the region (D'Almeida et al. 2007,
Foley et al. 2007, Sampaio et al. 2007). Predominant winds in Amazonia blow from
east to west, meaning that forests lying to the west of reserves are the ones
that benefit from the evapotranspiration of the trees in the reserve. Reserves
in eastern Amazonia would have the greatest benefit for maintaining rainfall
within the Amazon region, while reserves in western Amazonia would have the most
direct benefit in maintaining water-vapor transport to São Paulo and other parts
of south-central Brazil (Fearnside 2004).

THREATS TO AMAZONIAN FOREST

DEFORESTATION

Amazonia's forests face serious threats, and the
tendency is for many of them to increase in the future (Fearnside 2005a). Direct
deforestation, by felling the forest with chainsaws, is the predominant cause of
forest loss today.The great majority of deforested land becomes cattle pasture,
either directly following clearing or after a brief period of agricultural use
for annual crops. Pasture has been estimated to occupy 80% of the area
deforested by 1995 (Barreto et al. 2005). Soybeans represent a recent addition
to the forces driving deforestation. Soybeans are concentrated in certain
locations in Amazonia, but they have a much more far-reaching effect on
deforestation by providing the economic justification for major highway projects
(Fearnside 2001b, 2002a, 2007). Roads are the primary force inducing the spread
of deforestation (Laurance et al. 2001a, Nepstad et al. 2001, Soares-Filho et
al. 2004, 2006). The continued expansion and improvement of the road network,
together with the inflows of population and investment that the roads attract,
point to continued increase in deforestation pressure in the coming years. This
long-term trend is more fundamental than some of the forces that can cause
fluctuations in the annual rate of deforestation, such as repression campaigns
and price oscillations of beef and soybeans and of the exchange rate of the
Brazilian real against the US dollar. These short-term influences are relevant
to the dip in Amazonian deforestation rate in 2005, 2006 and 2007, as well as to
a ressurgence in Mato Grosso in 2007 when commodity prices began to recover
(Souza Jr. et al. 2007). The trend since 1991 has been one of steady increase,
as would be expected from the increases in underlying factors such as roads,
population and investment (Laurance et al. 2001b, Fearnside 2005a).

Deforestation takes place in the context of a
diverse array of actors, with great differences between locations in terms of
who is responsible. Cattle ranchers are the greatest force. In addition to
ranching for the ''legitimate'' economy - producing beef for sale - there is
also a significant parallel economy. Money can be made from land speculation,
where land is obtained cheaply and later sold for a much higher price,
especially if legal title can be obtained and/or if a highway is built nearby
(Fearnside 1987, Hecht et al. 1988). Deforestation of at least part of the land
claim is the primary means of maintaining possession of the area and defending
theinvestment against either invasion by squatters or expropriation by the
government. Clearing also takes place as a use for money that is "laundered''
when the funds are derived from illegal sources such as drug trafficking,
government corruption, sale of stolen property and tax evasion. If money has
come from an illegitimate source, the normal financial assumptions will not
apply to the visible portion of the economy and more money may be spent than is
returned in the form of beef sales. The proceeds, however, will be "clean''
money that can be used in the open economy.

Forest is also lost due to flooding from
hydroelectric dams. This land use is planned to occupy vast areas, ultimately
totaling as much as 10 million hectares (Brazil, ELETROBRAS 1987, see Fearnside
1995a). This corresponds to 2% of Brazil's 5 million km2 Legal Amazon
region, or 3% of the originally forested portion of theregion. In addition to
directly flooding forest, hydroelectric projects have much wider impacts in
stimulating road building, migration and deforestation (Fearnside 1989c, 1999c,
2001c, 2005b, 2006b).

LOGGING AND FOREST FIRES

Forest degradation through logging is a major
factor in forest loss because of its interactions with other processes. Logging
is often a prelude to deforestation, facilitating clearing by providing access
on logging roadsand by providing money to landholders through thesale of timber
(Asner et al. 2005, 2006). Logging alsogreatly increases the probability of
forest fires (Uhl and Buschbacher 1985, Alencar et al. 2004, 2006). These
initiate a vicious cycle where fire kills trees by burning the bark at the base
of each trunk (Barbosa and Fearnside 1999, Barlow et al. 2002). Next fire will
be hotter and more destructive than the first one (Nepstad et al. 1999, 2001).
After about three passages of fire the forest is destroyed and will appear as
deforested on satellite images (Cochrane et al. 1999, Cochrane 2003).

CLIMATE CHANGE

Climate change is an increasing threat to Amazonian
forest and some climate models (such as the Hadley Center model of the UK
Meteorological Office) indicate a threat to the entire forest within the current
century if global warming continues unabated (e.g., Cox et al. 2004). Even an
average of the results of 15 different models, including those with less extreme
outputs than the Hadley Center model, indicates the eastern portion of Amazonia
being transformed from forest to savanna as a result of climate change (Salazar
et al. 2007). Several factors are not included in the models that wouldgreatly
increase the damage, especially direct deforestation, logging and forest
fires.

MEASURES TO AVOID DEFORESTATION

Measures to avoid deforestation, also called
"reduction of deforestation and degradation'' (REDD), can be grouped into the
following categories:

REPRESSION BY COMMAND AND CONTROL

The main focus of government action to date has
been on repressing deforestation through inspection and fines. Deforestation
licensing combined with repression ofunlicensed clearing was sucessful in
reducing deforestation rates in Mato Grosso over the 1999-2001 period, providing
a valuable demonstration of the capacity of government regulation to influence
deforestation rates (Fearnside 2003b, Fearnside and Barbosa 2003).

PROTECTED AREAS

Protected areas are an essential part of strategies
to contain deforestation and the consequent release of carbon. In Brazilian
Amazonia the demarcation of indigenous areas is particularly important because
of the large area they cover and because of the role played by the indigenous
peoples in actively defending their land from deforestation.

INFRASTRUCTURE DECISIONS

The history of highways in Amazonia shows a clear
pattern of rapid clearing whenever a road is built or improved. Infrastructure
decisions have a great influence on future deforestation, not only from the
highway itself but also from migration of population and capital to new areas
beyond the roads (Fearnside and Graça 2006, Fearnside 2007). This is a key part
of the process that is not yet understood by many: it is not enough to create
reserves and repress unauthorized clearing if new highways continue to
proliferate.

DEVELOPMENT POLICIES

Government development policies that affect
deforestation include incentives for pasture and sawmills. Even today, the
corporations that own ranches financed in the 1970s by the Superintendency for
Development of Amazonia (SUDAM) can escape taxes on income earnedoutside of
Amazonia by investing in their Amazonian properties (Brazil, MF, Secretaria da
Receita Federal 2007, p. 341).

A long-standing policy issue is the land-tenure
regulation that bases the granting of title to untitled(public) lands on showing
that the claimant has made a "benfeitoria'' (literally an "improvement,''
which basically means deforestation). The result is a built-in motive to clear
regardless of what prohibitions or punishments may be enacted. Although many
years have passed since this problem was raised (Fearnside 1979), it is
still a fundamental driver of deforestation in the region. Another policy
matter is agricultural financing, as government-subsidized credit is a major
force behind expansion of both crops such as soybeans and more modest
small-farmer agriculture.

On the side of slowing deforestation, a variety of
policy measures that are largely ineffective are often presented as
deforestation countermeasures. For example, environmental education, while a
worthwhile activity, is unlikely to be convince those who are actually cutting
the forest. Another measure frequently invoked is agroforestry, but this land
use is restrained from occupying very large areas by a variety of economic and
physical limitations, and its role in discouraging forest clearing is limited
(Fearnside 1995b). Agroforestry has a role in directly sequestering carbon
(Tipper and De Jong 1998, De Jong et al. 2004). This land use also has an
important potential role in Amazonia in providing a more sustainable form of
agricultural production to small farmers (Smith et al. 1998).

The role of urbanization in reducing is
controversial. Wright and Muller-Landau (2006) have suggested that this trend
could significantly slow deforestation, but this has been strongly contested
(Laurance 2006, Sloan 2007). The Manaus Free Trade Zone (SUFRAMA), which
receives federal fiscal incentives as a policy decision to develop Amazonia, is
claimed by the Amazonas state government as an effective break on deforestation
due to the city's attraction of rural population.

Certification of various production activities has
been proposed as a mitigation measure, but the results have been mixed. An
example of the problem is provided by the 2006 loan from the International
Finance Corporation (IFC), of the World Bank group, to a large slaughterhouse in
Marabá, Pará (Folha de São Paulo 2007). In this case a certified activity
can lead to more rather than less deforestation because the profitability of
additional deforestation on many unregulated ranches in the surrounding area
will also increase due to the presence of the slaughterhouse, leading to more
deforestation. Nevertheless, certification initiatives for soybeans, beef and
timber all have potential benefits in bringing these sectors into compliance
with environmental laws and in minimizing their impacts (e.g., Zarin et al.
2004).

Agricultural intensification has been promoted as a
means of avoiding deforestation (Sánchez et al. 1982). However, a variety of
effects prevent this from assuming the desired role of slowing the loss of
natural forest (Fearnside 1990). A similar intensification of ranching (Batjes
and Sombroek 1997) also faces resource limits (Fearnside and Barbosa
1998).

ENVIRONMENTAL SERVICES AS
DEVELOPMENT

DIRECT PAYMENTS FOR ENVIRONMENTAL SERVICES
(PES)

Direct payments for environmental services can
sometimes be more effective in achieving environmental goals than are indirect
programs to promote sustainable development, for example in the buffer zones
around protected areas (Ferraro and Kiss 2002). Payment for environmental
services (PES) programs in Costa Rica and Mexico are the ones with the most
practical experience out of many such programs that have recently been initiated
in tropical countries (Karaousakis 2006, 2007). Such programs are often
criticized for paying the rich landholders instead of using government funds for
more socially desirable ends that would reduce the inequalities in wealth
distribution (Zbinden and Lee 2005, Grieg-Gran et al. 2005). In addition, the
programs are often paying ranchers and other actors who have beendestroying the
forest, while traditional forest peoples who have much less impact are left with
no reward for the environmental services of the forest.

The Proambiente program is designed to compensate
the environmental services of small farmers who adopt agroforestry systems and
maintain the carbon stocks in their properties (Mattos et al. 2001, Brazil, MMA
2003). The program depends on the budget of the Ministry of the Environment and
has frequently not had funds available to pay the farmers as promised, therefore
leading to a loss of credibility with local populations in the 13 pilot sites in
Amazonia. Another PES program began in September 2007 in the state of Amazonas.
In this program the state government pays a "forest stipend'' (bolsa floresta)
to small farmers and extractivists in state-owned land in exchange for a signed
commitment to refrain from deforestation (Viana and Campos 2007). The program
also has a component to compensate these farmers for ceasing to sell manioc
flour as a commercial crop; the Amazonas state secretariat of the environment
and sustainable development (SDS) expects the corresponding supply of demand for
manioc flour in Manaus to be supplied from input-intensive farms outside of
Amazonia, especially in Paraná. It should be noted, however, that the Amazonas
state secretariat of rural production (SEPROR) hopes to increase manioc
production by farmers in the state to make Amazonas self-sufficient in this
dietary staple.

VALUING ENVIRONMENTAL SERVICES

Time and the value of forest

What choices are made in allocating effort for
conservation are heavily dependent on how the accounting for environmental
services is done. In the case of the global-warming mitigation, the value
attributed to the deforestation that is averted by an action such as creation of
a forest reserve is heavily dependent on decisions regarding the value of time.
Time can be given value in various ways in carbon calculations: by applying to
carbon either a discount rate or some alternative time-preference formulation,
by setting a time horizon for the calculation, or both. I have argued that the
value attributed to reserve creation will depend on whether the reserves are
created near the deforestation frontier, where reserves that can be created are
smaller and their cost higher but their benefit is almost immediate. If reserves
are created far from the frontier, they are large and inexpensive but their
carbon benefit will only occur at a future date when the deforestation frontier
reaches the area. Tradeoffs therefore exist between reserve proposals in
different locations (Fearnside and Ferraz 1995). Tradeoffs also exist between
reserve creation and other types of mitigation measures, including avoided
deforestation through command-and-control operations, tree planting and
reduction of fossil-fuel emissions.

A quantitative example is given in Fearnside et al.
(2000, p. 262-264) comparing the carbon benefits of reserve creation with those
of slowing the overall deforestation rate, as through enforcement of
deforestation regulations with inspection and fines. The discount rate is the
critical factor in determining which strategy is most beneficial in combating
global warming. At a discount rate of 1%/year, a 50% reduction in deforestation
has the same value as converting 5% of the forest area into a protected area,
whereas one would have to convert 22% to a protected area to have this effect if
the discount rate were 5%/year. The long-term nature of carbon-stock protection
afforded by protected areas gives them a strong advantage when the long term is
given priority. Reserves have permanence that command-and-control restraints on
deforestation lack, giving them additional value in avoiding climate change
(Dutschke 2007).

This author has argued that some value should be
attached to time. While proposals for the appropriate discount rate vary from 0%
(e.g., Greenpeace International 2000, Kirschbaum 2006) to market rates of around
12% per annum (e.g., van Kooten et al. 1997), a modest value (on the order of
1%/year), or its equivalent through alternative accounting mechanisms, would
avoid distortions that militate against forests and against other societal
interests at either the high or the low end of the range of possible discounts
(Fearnside 2002b, c). If no value is given to time, future climate change,
including glacial cycles that may be millenia in the future, eliminate any value
of maintaining forest as a mitigation option. If the future is discounted very
sharply, then the benefit of a reserve is also eliminated because the benefit
would accrue after the value of the carbon has been discounted to a value near
zero. Time preference represents an important difference between carbon and
biodiversity considerations, and can result in different strategies being
identified as priorities (Fearnside 1995c). The outcome of an ongoing
theoretical battle over the value attached to time in carbon calculations is
critical to any valuation of forest maintenance as a global-warming mitigation
measure (Kirschbaum 2006, Fearnside 2008).

Permanence has been addressed by several proposals
(including the ton-year accounting suggested by this author in 1992; see
Fearnside et al. 2000), but the most politically tractable solution is the
Colombian Proposal for temporary certified emissions reductions, or t-CERs
(Blanco and Forner 2000). This is the approach adopted in the 2001 Marakesh
Accords for afforestation and reforestation projects under the Clean Development
Mechanism of the Kyoto Protocol (UN-FCCC 2001). Ways of accounting for
"fractions of permanence'' (Dutschke 2002) are needed in order to adjust
mitigation decisions to the reality that no carbon is really permanent.

Stocks versus flows

The above discussion implies carbon accounting
based on "additionality,'' or emissions reductions relative to a hypothetical
(counterfactual) baseline representing what would have been emitted in a
reference scenario without a mitigation action, such as creation of a forest
reserve. This is the basis of accounting under the Kyoto Protocol's Clean
Development Mechanism (UN-FCCC 1997, Article 12). Prior to the December 1997
Kyoto Protocol, this author proposed compensating environmental services of
Amazonian forest based on stock maintenance, that is, with payments as an annual
percentage of the stock value similar to the interest that is earned on a
savings account in a bank (Fearnside 1997b). This form of accounting has
recently re-emerged in discussion of how to market the carbon benefits of the
''Amazonas Initiative'' of the Amazonas state government. State governments in
Brazil are becoming important actors in driving both diplomatic and technical
advances towards making the environmental services of Amazonian forests into a
force for environmental protection. These efforts complement federal initiatives
such as that of the Ministry of the Environment's Protected Areas in Amazonia
(ARPA) program. All of these initiatives require improvements in the knowledge
base and in the human and physical resources needed for evaluating carbon stocks
and properly accounting for and rewarding their maintenance.

The question of whether stocks or additionality
(i.e., the basis of credit under the Kyoto Protocol's Clean Development
Mechanism) should be the basis of accounting depends very much on the stage to
which deforestation has advanced in an area. In locations where much has already
been cleared (thereby providing a historical baseline) and rapid deforestation
is underway, as in much of the state of Mato Grosso, the additionality criterion
works well. In cases where very little has been cleared, as in the state of
Amazonas, additionality will not work, at least not if calculated from a
historical baseline. Additionality can be made to work in this situation with a
simulated baseline based on planned road construction, or alternatively
additionality can be replaced with stocks-based accounting. In cases where
deforestation is well advanced and the rate is slowing for lack of available
forest to clear, the historical baseline will no longer be appropriate (e.g.,
some parts of Mato Grosso: Fearnside 2003b). In places where the forest has
almost all been cleared already, a historical baseline will produce "hot air,''
or credit with no climate benefit.

The choice between the two accounting methods has a
strong influence on the social outcome. Under additionality the major
beneficiaries are likely to be ranchers in Mato Grosso, whereas forest peoples
in the state of Amazonas would be rewarded by the stocks-based approach. In
either case, it is important that the baseline be based either on past history
(i.e., on a period before carbon credit came under discussion) or on trends
derived from past history. This is needed to avoid any possibility of
stimulating clearing in order to raise the baseline and increase subsequent
carbon credit. It is possible to have several systems simultaneously for forests
in different situations.

INSURING THAT BENEFITS ARE REAL

Regardless of the accounting method, a basic
priority is a system in which payments are only made for carbon benefits that
are actually achieved, not for promises. It must be on a "pay-as-you-go'' basis,
not the "up-front'' payments that project proponents inevitably want. For
example, projects commonly call for planting a seedling and expect immediate
credit for a full-grown tree. Guaranteeing that any carbon credit granted
represents a real benefit for climate that has been accounted for in a fair,
transparent and verifiable way is essential, and any deviation from this has a
much greater potential environmental cost than the impact of any carbon emission
that has been improperly permitted. The principal cost of such deviations is in
jeopardizing the entire effort to develop an economy based on environmental
services.

In the case of avoided deforestation, one must take
the debit when deforestation increases along with the credit when it decreases.
Otherwise the mitigation program has no more real benefit than speculating in
the stock market, where the objective is to "buy low and sell high.''
Deforestation rates in Amazonia have risen and fallen with various
macro-economic factors affecting availability of investment funds, commodity
prices, exchange rates, inflation, land values, etc. (Fearnside 2005a). These
oscillations have the potential to generate "hot air'' carbon credit if only the
decreases are counted.

Uncertainty is inherent in avoided-deforestation
proposals, both with respect to the amount of emission avoided per hectare and
the number of hectares avoided. Uncertainty is greater for avoided deforestation
than for many other mitigation options, such as silvicultural plantations.
Although progress has been made on reducing these uncertainties, much remains.
In choosing between mitigation options and in assigning the credit to each,
application of an overly demanding standard for uncertainty has substantial
drawbacks because of a tradeoff between uncertainty and opportunity for climate
benefits (Fearnside 2000c).

"Leakage'' is one of the fears frequently raised
with respect to avoided deforestation. Leakage refers to the carbon benefits
from a mitigation project being wholly or partially nullified by emissions
provoked by the project outside of its boundaries (including not only spatial
boundaries, but also boundaries in terms of time and in terms of conceptual
framework). For example, if a reserve is created, the people who would have been
clearing forest in the reserve may simply move to another location in the region
and clear just as much forest at the new location, thereby cancelling out the
climatic benefit of the reserve. Most leakage is solved by accounting at the
national level or at least at the level of very large political units, such as
the state of Amazonas (1.5 million km2).

Unresolved issues need not be obstacles. Above all,
it is a matter of attitude that determines if the existence of a problem is used
as an excuse to reject proposals such as those to grant carbon credit for
avoided deforestation, or whether the problem is viewed as just one more
challenge to be faced and overcome. Our effort should go into solving the
problems that can be identified and get on with the task of creating the
institutional structures that are capable of turning the value of environmental
services into monetary flows. These flows must be on the scale that is needed to
change the course of history in Amazonia.

CONCLUSIONS

There is no time to lose in combating deforestation
and in reducing impacts such as greenhouse-gas emissions. In the coming years
critical thresholds are likely to be crossed in Amazonia, both in the
deforestation process and in the forest's resistance to global warming. Waiting
to take action makes the situation much worse because of delays in various parts
of the system including the climate system (emissions-warming), the feedbacks
that cause forest degeneration (global warming-savannization), and the impact of
decisions (road building-deforestation). All this points to the importance of
acting now rather than waiting for climate impacts to become more apparent.
Containing deforestation will require more than increased enforcement of
environmental regulations: it will require giving value to forest maintenance by
rewarding environmental services. Maintaining carbon stocks is the environmental
service closest to becoming a basis for substantial monetary flows, although
biodiversity and water cycling also have great importance and could generate
additional flows over the long term. Rewarding carbon benefits requires
appropriate accounting procedures for each phase of the deforestation process:
the initial phase where little or no clearing has taken place, the phase of
rapid clearing where plenty of forest remains available for clearing, and the
declining phase where available forest is dwindling. Current negotiations focus
on reducing carbon flows in the second of these phases, but additional
arrangements are needed to reward carbon stocks for forests in the first phase,
such as large areas in Brazil's state of Amazonas. For these largely intact
areas, current decisions on highway construction and reserve creation are
critical to the future fate of the forest.

ACKNOWLEDGMENTS

The Conselho Nacional do Desenvolvimento Científico
e Tecnológico (CNPq: Proc. 306031/2004-3, 474548/ 2006-6, 557152/2005-4,
420199/2005-5), Rede GEOMA and the Instituto Nacional de Pesquisas da Amazônia
(INPA: PPI PRJ05.57) contributed financial support. I am grateful for helpful
reviewer comments.

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Correspondence to:
Philip Martin Fearnside
E-mail: [email-masked]

Manuscript received on October 8, 2007; accepted
for publication on January 21, 2008; contributed by Philip M. Fearnside*

*
Member Academia Brasileira de Ciências

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Brasileira de Ciências

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