The burning of fossil fuels has caused an increase in temperature around the world. That is called Global Warming. As carbon dioxide and other gasses on earth’s atmosphere increased, they allow the sun rays pass through but they then trap a lot of heat. Burning of fossil fuels like coal, oil and natural gas combine produce large amount Carbon dioxide as this amount of gas increases, the earth becomes warmer. That is global warming. It is harmful and steps are to be taken to check it. Tree plantation is one of the measures to control it.