G2TT
来源类型Working Paper
规范类型论文
World Greenhouse Gas Emissions in 2005
Tim Herzog
发表日期2009-07
出版年2009
语种英语
概述

Executive Summary

Comparison to 2000: Land-Use Change

The most significant change compared to 2000 concerns the net contribution of atmospheric CO2 from land-use change. In both 2005 and 2000, these data come from research published by Woods Hole Research Center, which was revised in 2008. Revised rates of deforestation in the underlying Forest Resources Assessment (FRA) data produced significantly lower estimates of CO2 from land use change compared to the previous research. As a result, CO2 from land use change accounts for a significantly lower share of GHGs than in the original chart: 12.2% as compared to 18.2%.

It is important to note that:

  • In the revised data, total CO2 emissions from land-use change increased between 2000 and 2005. It is only the share of emissions attributed to land-use change that decreased. This result reflects that fact that while emissions in the land-use change increased, emissions in other sectors increased at even faster rates.
  • The apparent decrease in land-use change emissions compared to the 2000 chart is entirely due to revised methodologies used to calculate deforestation in the underlying FRA data, and not to any actual decrease in deforestation rates. The working paper discusses this in more detail.
  • Estimates of CO2 from land use change are still subject to large uncertainties. Studies cited by the IPCC 4th Assessment Report show error ranges of up to ±2,933 MtCO2 (±0.8 GtC) at the global level in the 1990s.

Update: In November 2009, a group of forest experts (which included WRI) released a statement on how new research was producing revised, lower estimates of emissions from land-use change. That statement put the best current estimate at about "15 percent if peat degradation is included," cautioning that a precise estimate is impossible due to substantial uncertainties. The joint statement is consistent with the 12.2% estimate in this chart, since the latter does not include peat degradation.

摘要

World Greenhouse Gas Emissions in 2005 is a comprehensive view of global, anthropogenic greenhouse gas (GHG) emissions. The chart in this working paper is an updated version of the original chart, which appeared in Navigating the Numbers: Greenhouse Gas Data and International Climate Policy (WRI, 2005).

主题Climate
标签emissions inventories ; greenhouse gases ; UNFCCC
URLhttps://www.wri.org/publication/world-greenhouse-gas-emissions-2005
来源智库World Resources Institute (United States)
资源类型智库出版物
条目标识符http://119.78.100.153/handle/2XGU8XDN/27645
推荐引用方式
GB/T 7714
Tim Herzog. World Greenhouse Gas Emissions in 2005. 2009.
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