In addition to burning fossil fuels, human beings reduce the planets absorption of carbon dioxide from the atmosphere by cutting down trees. We also add methane to the atmosphere by raising cattle and other farm animals, such as geese, turkeys, pigs, chickens, and sheep. Scientists have shown that producing 1 kg of beef results in more CO emissions than going for a three-hour drive while leaving all the lights on at home. Additionally, human activity adds water vapor to the atmosphere through increased evaporation by the use of cooling towers in thermal cycle power plants or creation of artificial lakes. These activities contribute to global warming.