2007年-世界发展银行全球_Atmospheric_Stabilization_of_CO2_Emissions___Near-term_Reductions_and_Intensity-based_Targets_37页_958kb

Summary of "Atmospheric Stabilization of CO₂ Emissions: Near-term Reductions and Intensity-based Targets"

Core Content

This working paper by Govinda R. Timilsina from the World Bank examines the feasibility of stabilizing atmospheric CO₂ concentrations at 450 ppm (or 550 ppm including non-CO₂ greenhouse gases) by 2030. The paper evaluates the necessary emission reductions and intensity-based targets for different countries and regions, considering the impact of economic growth on these targets.

Main Objectives

• To analyze CO₂ emission reduction targets for countries and regions by 2030 to stabilize atmospheric CO₂ levels.
• To determine the required CO₂ intensity cuts for achieving these targets without sacrificing economic growth.
• To develop two scenarios for reversing the global CO₂ emission trend: one by 2020 and the other by 2025.

Key Findings

Global Emissions Trends

• Global CO₂ emissions are expected to increase significantly by 2030.
• If the trend is reversed by 2020, emissions would be 42% above the 1990 level by 2030.
• If the trend is reversed by 2025, emissions would be 52% higher than the 1990 level by 2030.
• To stabilize CO₂ at 450 ppm, global emissions must start declining before 2030.

Emission Intensity Targets

• The paper highlights that emission intensity (CO₂ per unit GDP) is a more politically acceptable target than absolute emission reductions, as it does not imply economic slowdown.
• To achieve the required emission reductions while maintaining economic growth, the global average CO₂ intensity must drop by 68% from the 1990 level or 60% from the 2004 level by 2030.

Country and Regional Analysis

• United States: Emissions are projected to increase significantly, with a higher growth rate than past.
• China: Expected to surpass the U.S. in CO₂ emissions by 2030, accounting for 26% of global emissions.
• India and Other Asia: Showed modest emission reductions in the past but are projected to significantly reduce intensity by 2030.
• Middle East and Africa: Experiencing higher emission intensity growth rates.
• Russia and Other Europe & Central Asia: Have seen substantial emission reductions in the past due to economic restructuring and geopolitical changes.

Kyoto Protocol and Emission Trends

• The Kyoto Protocol's emission targets for Annex I countries (developed nations) are insufficient to reverse the global emission trend by 2030.
• Without U.S. and Australia's participation, the effectiveness of the Kyoto Protocol is reduced.
• Non-Annex I countries (developing nations) are expected to surpass Annex I countries in total emissions by 2015.

Methodology

• The study uses the 2007 International Energy Outlook (EIA) and IEA data to project emissions and intensities.
• It calculates emission intensity targets based on the ratio of CO₂ emissions to GDP.
• Two scenarios are developed to reverse the global CO₂ trend:
  1. Scenario 1: Reversing the trend by 2025 with Annex I countries having higher mitigation targets and non-Annex I countries stabilizing emissions at 2025 levels.
  2. Scenario 2: Reversing the trend by 2020 with non-Annex I countries stabilizing emissions from 2020 and Annex I countries having similar targets as in Scenario 1.

Conclusion

• Developing countries are expected to play a more significant role in future CO₂ emissions than developed countries.
• Emission intensity-based targets are more viable for policy implementation, especially when economic growth is a priority.
• The paper emphasizes the need for more ambitious emission reduction targets from Annex I countries and a shift towards intensity-based approaches for effective climate mitigation.