In terms of the net increase in the greenhouse effect due to humanproduced greenhouse gases, CO 2 is responsible for the lion's share CO 2 from fossil fuel burning alone is more than half the net force If you add CO 2 from fossil fuel burning, deforestation, and other minor sources, this comes to a little more than threefourths of the netMethane is the next of the greenhouse gases which has the biggest effect on global warming (15%) This is generated by activities such as livestock production, agriculture, sewage treatment, natural gas and oil distribution , coal mining, fuel use and is also given off from waste tips It lasts an average of 12 years in the atmosphereThis is called the "greenhouse effect" Up to a point, the greenhouse effect helps keep the Earth at a temperature suitable for life As more greenhouse gases are pumped into the atmosphere, however, the temperature increases and there's a risk of creating feedback effects that could make the Earth warmer still
The Greenhouse Effect
