Question

HOW MANY GASES ARE ENVOLVED IN GREENHOUSE EFFECT? PLEASE REPLY

Answer 1

greenhouse gas(abbrev.GHG) is agasin an atmosphere thatabsorbsandemitsradiation within thethermal infraredrange. This processis the fundamental cause of thegreenhouse effect.[1]The primary greenhouse gases inEarth's atmospherearewater vapor,carbon dioxide,methane,nitrous oxide, andozone. Without greenhouse gases, the average temperature ofEarth's surfacewould be about−18 °C (0 °F),[2]rather than the present average of 15 °C (59 °F).[3][4][5]In theSolar System, the atmospheres ofVenus,MarsandTitanalso contain gases that cause a greenhouse effect.Human activities since the beginning of theIndustrial Revolution(taken as the year 1750) have produced a 40% increase in theatmospheric concentration of carbon dioxide, from 280ppmin 1750 to 400 ppm in 2015.[6][7]This increase has occurred despite the uptake of a large portion of the emissions by various natural "sinks" involved in thecarbon cycle.[8][9]Anthropogeniccarbon dioxide (CO2) emissions (i.e. emissions produced by human activities) come fromcombustionofcarbon-based fuels, principallycoal,oil, andnatural gas, along with deforestation, soil erosion and animal agriculture.[10]It has been estimated that if greenhouse gas emissions continue at the present rate, Earth'ssurface temperature could exceed historical values as early as 2047, with potentially harmfuleffects on ecosystems, biodiversity and the livelihoods of peopleworldwide.[11]Recent estimates suggest that on the current emissions trajectory the Earth could pass a threshold of 2 °C global warming, which the United Nations'IPCCdesignated as the upper limit for "dangerous" global warming, by 2036.[12]