Last reviewed on May 13, 2014

California 1990 Greenhouse Gas Emissions Level and 2020 Limit

Main sources (Wastewater treatment, manure management, fossil fuel combustion, organic and synthetic nitrogen fertilizers) of nitrous oxide
Main sources of nitrous oxide

Board Item

The Global Warming Solutions Act of 2006 (AB 32) requires that the Air Resources Board determine the statewide greenhouse gas emissions level in 1990. The act also requires that the Board approve a statewide greenhouse gas emissions limit, equal to that level, be achieved by 2020.

Based on its 1990-2004 inventory work, ARB staff recommended 427 million metric tonnes of carbon dioxide equivalent (MMTCO2e) as the total statewide greenhouse gas 1990 emissions level and 2020 emissions limit. The Board approved the 2020 limit on December 6, 2007. This limit is an aggregated statewide limit, rather than sector- or facility-specific. The Board hearing materials are listed below.

Staff Report

The staff report titled "California 1990 Greenhouse Gas Emissions Level and 2020 Emissions Limit" discusses the development of the 1990 statewide emissions level and provides a summary of the key emissions sources, the methodologies used to calculate the emissions, and the sources of data. Full documentation of data sources and methods is available to the public on this web site.