Greenhouse gas
In addition to burning fossil fuels, human activities also reduce the earth's capacity to absorb carbon dioxide from the atmosphere by deforestation. Methane emission is also increase due to the activities like raising cattle and other farm animals, including as geese, turkeys, pigs, chickens, and sheep. Scientists have shown that producing 1 kg of beef generated more CO2 emissions than a three-hour drive with all household lights on. Further, human activity introduces water vapor to the atmosphere through increased evaporation from cooling towers in thermal cycle power plants and creation of artificial lakes which contributes to the  global warming.