https://www.epa.gov/climate-indicators/climate-change-indicators-atmospheric-concentrations-greenhouse-gases
https://www.epa.gov/climate-indicators/climate-change-indicators-atmospheric-concentrations-greenhouse-gases
WWW.EPA.GOV
Climate Change Indicators: Atmospheric Concentrations of Greenhouse Gases | US EPA
This indicator describes how the levels of major greenhouse gases in the atmosphere have changed over time.
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