2010年-世界发展银行全球_Economics_of_Adaptation_to_Climate_Change___Mozambique_130页_5mb

Summary of Economics of Adaptation to Climate Change for Mozambique

Core Content

This report is part of the Economics of Adaptation to Climate Change (EACC) global study, which aims to estimate adaptation costs for developing countries and help decision-makers understand climate risks and design effective adaptation strategies. The Mozambique case study is one of three African countries included in the EACC "country track" study, alongside Ghana and Ethiopia.

The study evaluates the economic impacts of climate change on key sectors such as agriculture, energy, transport, and coastal zones, and explores adaptation options to mitigate these impacts. It uses climate change scenarios derived from Global Circulation Models (GCMs) and integrates them with a dynamic computable general equilibrium (CGE) model to provide a macroeconomic perspective on the implications of climate change.

Main Sectors and Their Vulnerabilities

1. Agriculture

• Contribution to Economy: Accounts for 24% of GDP and 70% of employment.
• Impact of Climate Change:
  • Net average crop yield is lower than baseline in all scenarios.
  • Projected yield reductions range from 2-4% over the next 40 years, especially in the central region.
  • Increased flooding frequency affects rural roads, leading to GDP losses of 4.5% (conservative) and 9.8% (most pessimistic).
• Adaptation Options:
  • Road redesign is highlighted as a powerful adaptation measure.
  • Limited consideration was given to ecosystem services and malaria prevalence.
  • The study suggests that improved land use planning, weather information access, and building codes are important but not modeled.

2. Energy (Hydropower)

• Current Access: Only 7% of the population has access to electricity, primarily from hydropower in the Zambezi Basin.
• Impact of Climate Change:
  • Potential energy deficit is estimated at approximately 110,000 GWh between 2005-50.
  • Climate change impacts on energy supply are modestly negative (1.4% less electricity generated than baseline), except for the most pessimistic scenario.
  • The main concern is increased evapotranspiration, reducing water availability for power generation.
• Adaptation Options:
  • Focus on managing water release timing to ensure downstream flow and avoid port interference.
  • No analysis was conducted on other energy forms (fuelwood, coal).

3. Transport Infrastructure (Roads)

• Current Status: Mozambique has one of the lowest road densities per person in Africa.
• Impact of Climate Change:
  • Severe rainfall events increase damage to roads, culverts, and bridges.
  • Economic losses from reduced access are significant.
• Adaptation Options:
  • Road redesign is a key adaptation strategy.
  • Cost increases for road maintenance are modeled under different scenarios.
  • The report includes cost estimates for gravel and paved roads under various climate projections.

4. Coastal Zones

• Impact of Sea Level Rise (SLR):
  • Without adaptation, up to 4,850 km² of land could be lost by the 2040s (0.6% of national land area).
  • Up to 916,000 people (2.3% of the 2040s population) could be displaced.
  • Annual damage costs could reach $103 million in the worst-case scenario.
• Adaptation Options:
  • Beach nourishment and dike construction are considered.
  • The study highlights the need for proactive adaptation to mitigate land loss and forced migration.

Key Findings

• Climate Change Scenarios:
  • Four GCM outputs are used: two global (dry and wet) and two regional (Mozambique dry and wet).
  • The global wet scenario is not necessarily wet in Mozambique, and vice versa.
• Economic Impacts:
  • Climate change is expected to reduce economic growth rates, particularly in agriculture and transport.
  • By 2050, the net present value of damages (discounted at 5%) could reach $7.6 billion, equivalent to an annual cost of over $400 million.
• Adaptation Costs:
  • The cost of adaptation is calculated at both sectoral and economy levels.
  • Adaptation measures can significantly reduce damage and migration costs.
• Macro-Economic Modeling:
  • A CGE model is used to assess the aggregate economic impact of climate change.
  • The model shows that without adaptation, GDP could fall by 4-14% compared to baseline growth in the 2040-50 period.

Social Dimensions

• The study acknowledges the importance of social factors in adaptation.
• It highlights the need for improved public awareness, communication, and access to weather information.
• Socially inclusive adaptation strategies, such as participatory scenario development, are recommended to ensure pro-poor outcomes.

Conclusion

The EACC study for Mozambique provides a comprehensive analysis of the economic and social impacts of climate change, with a focus on adaptation strategies in key sectors. It emphasizes the need for proactive measures to address the risks posed by climate change, particularly in agriculture, energy, transport, and coastal zones. The report underscores the importance of integrating climate change into national planning and development strategies to ensure long-term resilience and sustainable growth.