| unfccc.int
In the past 60 years, carbon dioxide in the atmosphere has increased 100-200 times faster than it did during the end of the last ice age.| NOAA Climate.gov
Includes information on global greenhouse gas emissions trends, and by type of gas, by source, and by country.| US EPA
Sources of greenhouse gas emissions, inculding electricity production, tranportation, industry, agriculture, and forestry.| US EPA