WASHINGTON, DC, April 21, 2009 (ENS) - Atmospheric concentrations of two of the most potent global warming gases rose last year, according to a preliminary analysis for the annual greenhouse gas index compiled by the U.S. National Oceanic and Atmospheric Administration, NOAA, which tracks data from 60 sites around the world.
At the end of December 2008, researchers measured an additional 16.2 billion tons of carbon dioxide, CO2, a byproduct of fossil fuel burning, and 12.2 million tons of methane in the atmosphere.
Human activities that emit methane include fossil fuel production, animal husbandry, rice cultivation, biomass burning, and waste management landfills.
These increases occurred despite the global economic downturn, which slowed many activities that depend on burning coal, oil and gas.
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