2023-05-08-亚开行-全球向净零转型中的亚洲_2023年亚洲发展展望_主题报告（英）_114页_9mb

Summary of Asia in the Global Transition to Net Zero (Asian Development Outlook 2023 Thematic Report)

Core Content

Asia is at the forefront of the global transition to net zero, both as a vulnerable region and as a major contributor to greenhouse gas (GHG) emissions. The report outlines the region's role in climate action, the economic and social implications of decarbonization, and the policy frameworks needed to support a just and efficient transition.

Main Points

1. Asia's Special Stake in the Global Climate Crisis

• High Vulnerability: Developing Asia is highly vulnerable to climate change due to its geographic location, population density, and socioeconomic conditions.
• Climate Risks: The region is facing increased frequency and severity of climate-related events such as storms, floods, heat waves, and droughts.
• Sea Level Rise: About 70% of the global population at risk from sea level rise is in Asia.
• Economic Impact: Climate change threatens food security, livelihoods, and health, especially for the poor. Under a high emissions scenario, GDP losses in developing Asia could reach 24% by 2100, with higher impacts in India (35%), Southeast Asia (30%), and the rest of South Asia (24%).

2. Asia's Transformation during the Global Transition to Net Zero

• Key Policy Choices: The degree of mitigation ambition, timing of mitigation, and extent of international cooperation (e.g., carbon markets) are critical.

• Emission Pathways: Five key scenarios are analyzed:

  • Current Policies
  • NDCs (Nationally Determined Contributions)
  • Uncoordinated Pathways toward Net Zero
  • NDCs followed by Coordinated Action toward Global Net Zero
  • Accelerated Action toward Global Net Zero

• Energy Efficiency and Renewables: Energy efficiency and the transition to cleaner energy sources are vital in the short and long term, respectively.

• Coal Phase-Out: Even under modest climate action, the share of coal in primary energy will decrease from ~50% to ~13% by 2050.

• Land Use: Land use changes, particularly reforestation and expansion of bioenergy crops, will be a major mitigation source, especially in Southeast Asia (72% of emissions reduction by 2030 in Indonesia).

• Investment Needs: The transition to net zero will require substantial investments in the energy sector, with the accelerated net zero scenario calling for $707 billion in annual investments by 2050, equivalent to 1.5%-2.7% of GDP.

3. Socioeconomic Consequences of the Transition

• Cost-Benefit Framework: The benefits of climate mitigation (e.g., reduced climate damage, improved air quality) are estimated to be five times the costs.
• Policy Costs: The costs of achieving global net zero are modeled to be equivalent to a few months of economic growth, but they fall disproportionately on lower-income countries.
• Employment Impact: Deep decarbonization will lead to increased employment in the energy sector, particularly in renewable energy and energy efficiency.
• Equity Implications: Mitigation policies may have adverse effects on certain communities and populations, especially if not designed inclusively. Lower-income regions stand to gain the most from the transition due to the high co-benefits.

4. Policies for an Efficient and Equitable Transition

• Carbon Pricing: Carbon pricing is the most efficient tool for reducing emissions, but coverage and exposure remain low.
• Subsidies: Fossil fuel subsidies are still far higher than those for clean energy, hindering the transition.
• Policy Mix: A combination of pricing reforms, regulations, and incentives is necessary to mobilize private financing and support the transition.
• Support for Affected Groups: Policies must include support measures for those negatively affected to ensure a fair and politically sustainable transition.

Key Information

• Climate Pledges: All developing Asian economies have submitted NDCs under the Paris Agreement. 19 economies, representing ~80% of the region's 2019 emissions, have pledged to achieve net zero emissions.
• Renewable Growth: Developing Asia has led the world in solar and onshore wind capacity additions, with cost reductions enabling renewable energy to dominate electricity generation by 2040.
• Forest Expansion: Under the accelerated net zero scenario, forest cover in developing Asia is expected to increase by 95 million hectares by 2050, with China accounting for half of the increase.
• Energy Sector Transformation: The energy sector will require significant investment and reallocation toward cleaner sources. In 2021, $468 billion was invested in power supply, with $397 billion allocated to renewables, electricity networks, and storage.

Conclusion

The global transition to net zero is essential for Asia, given its vulnerability and growing contribution to emissions. While the costs of transition are significant, the benefits—particularly in terms of avoided climate damage and improved air quality—far outweigh them. The report emphasizes the need for international coordination, policy reform, and support for affected populations to ensure a low-cost, equitable, and sustainable transition.