what is the most important gas in the greenhouse effect
Greenhouse gas Human activities since the beginning of the Industrial Revolution (taken as sometime between the years 1740 and 1754) have produced a 40% increase in the atmospheric concentration of carbon dioxide, from 280 ppm in 1750 to 406 ppm in early 2017.[6] This increase has occurred despite the uptake of a large portion of the emissions by various natural "sinks" involved in the carbon cycle.[7][8] The vast majority of Anthropogenic carbon dioxide (CO2) emissions (i.e., emissions produced by human activities) come from combustion of fossil fuels, principally coal, oil, and natural gas, with comparatively modest additional contributions coming from deforestation, changes in land use, soil erosion, and agriculture (including animal agriculture), though some of the emissions of this sector are offset by carbon sequestration.[9][10]