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Per Capita GHG Emissions

This documentation is included as a companion to CAIT-U.S. data available through Google's Public Data Explorer, available for free and without registration at http://www.google.com/publicdata/overview?ds=z8cs5f2mcjthet_.

This documentation may be modified from the original version at http://cait.wri.org/cait-us.php?page=background&from=yearly&mode=view. In case of discrepancy, the original version must be considered authoritative.

Viewing CAIT-U.S. original documentation requires free registration and sign-in at http://cait.wri.org/register-frameset.php.

Note on emissions from Industrial Processes sector [as referenced in Google's Public Data Explorer]:

This sector produces approximately 2 percent of total U.S. GHG emissions. Emissions from the manufacture of nitric acid, adipic acid, ammonia and urea, HFCF-22, and magnesium are generally not included because of a lack of data. In addition, default estimates of emissions from limestone and dolomite use are unavailable for 1990-93, and estimates of emissions from iron and steel production--a large percentage of total industrial processes emissions in several states--are unavailable until 1997. As a result, many states exhibit "step functions" in their total industrial processes data--that is, a lack of complete industrial processes emissions data prior to 1997 causes an artificial increase in these data beginning in that year.

Note: In an effort to avoid presenting misleading comparisons with other sectors, trends in the industrial processes sector should only be assessed from 1997 through 2007.

Source: Calculated by WRI using CAIT-US GHG data and Population data from the U.S. Census Bureau (http://www.census.gov/):

Units: Tonnes (metric tons) CO2 equivalent per person (tCO2e/person).

Definition:

Per capita GHG emissions is a measure of greenhouse gas emissions per person in each U.S. state. GHG emissions, depending on user preference, can include the sum of state emissions of carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and F-gases (perfluorocarbons-PFCs, hydrofluorocarbons-HFCs, and sulfur hexafluoride - SF6). In the CAIT-U.S. website you may choose to include CO2 from land-use change and forestry; however, this option is not yet available in the Google Public Data Explorer. Population data are the annual estimated total resident population for each state. These data are developed by the U.S. Census Bureau with the assistance of The Federal-State Cooperative Program for Population Estimates.

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