2013年-世界发展银行全球_How_Much_is_the_Amazon_Worth__The_State_of_Knowledge_Concerning_the_Value_of_Preserving_Amazon_Rainforests_45页_2mb

How Much Is the Amazon Worth?

Summary of the State of Knowledge Concerning the Value of Preserving Amazon Rainforests

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Core Content

This paper explores the economic value of the Amazon rainforest and the implications of its preservation or conversion to other uses. It emphasizes the importance of quantifying both the direct and indirect benefits of maintaining the Amazon, as well as the opportunity costs of deforestation. The focus is on local and regional impacts, though global values are acknowledged as a relevant but complex dimension.

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Main Points

1. Economic Valuation of the Amazon

• The Amazon provides significant local and regional economic benefits through:

  • Timber and non-timber forest product extraction.
  • Eco-tourism.
  • Biological resources, including bio-prospecting.
  • Hydrological services such as watershed protection, hydropower, and rainfall regulation.
  • Fire prevention and control.

• These values are often difficult to quantify and are not always considered in policy decisions.

2. Global vs. Local Values

• Global values include:
  • Carbon sequestration and the prevention of carbon emissions.
  • Preferences for preserving the Amazon in higher-income countries, often expressed through willingness to pay for environmental services.
• Local values are more tangible and include direct benefits from the forest.
• While global values can tip the balance in favor of protection, they are hard to integrate into local decision-making due to the lack of effective mechanisms to transmit incentives to land users.

3. Drivers of Deforestation

• Deforestation in the Amazon is driven by multiple factors:
  • Government policies that incentivize frontier expansion.
  • Infrastructure development (e.g., highways like Belém-Brasília and BR-364).
  • Land speculation and weak land governance.
  • Agricultural expansion, particularly cattle ranching and soybean farming.
  • Logging and the demand for timber.
  • The development of biofuels and food markets.
• These causes are often interrelated and have contributed to the loss of approximately 18% of the Amazon rainforest since 1970.

4. Policy and Market Mechanisms for Forest Protection

• Payments for Environmental Services (PES) are being explored as a tool to incentivize forest preservation.
• However, PES schemes face challenges, including:
  • The need for continuous payments, which are difficult to sustain long-term.
  • Asymmetric information and enforcement issues.
  • The risk of overcompensation or underpayment, which may not reflect the true value of the forest.
• REDD+ (Reducing Emissions from Deforestation and Forest Degradation) is a key policy initiative that aims to provide financial incentives for forest conservation. It goes beyond PES by including institutional frameworks and international financial mechanisms.

5. Challenges in Valuation

• Current data on the economic value of the Amazon is limited and often insufficient for accurate mapping of protection values.
• The valuation of forest services is still in its early stages, and there is a need for more comprehensive and systematic studies.
• The paper highlights the importance of integrating ecological and economic data to improve the effectiveness of conservation programs.

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Key Information

• The Amazon is home to about 20% of known terrestrial species and contains approximately 86 ± 17 Pg of carbon.
• It accounts for 10% of global net primary production and sequesters 0.49 ± 0.18 Pg of carbon annually.
• Deforestation has historically contributed 10–35% of global greenhouse gas emissions, though this share has decreased to 12% today.
• Forest fires in the Amazon release significant carbon emissions, with some extreme ENSO years resulting in up to 1.6 Pg of carbon emissions.
• Climate change may increase the risk of Amazon forest conversion to savanna-like ecosystems, reducing its capacity to act as a carbon sink.
• The paper calls for improved data and tools to support the valuation of Amazon rainforest services, particularly for policy implementation.

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Conclusion

The Amazon rainforest has substantial local and regional economic value, including climate regulation, water cycling, and biodiversity conservation. However, the valuation of these services remains incomplete and inconsistent. While PES and REDD+ initiatives offer potential pathways for forest protection, their success depends on accurate valuation, effective enforcement, and the ability to transmit global benefits to local land users. The paper underscores the need for more robust data and analytical tools to inform future conservation policies.