NASA has a great Web page on this called Earth's Fidgeting Climate , and see the Environmental Protection Agency's Global Warming FAQ's . The air that surrounds the earth. A heavy colorless gas that does not support combustion. It is formed naturally by the combustion and decomposition of organic substances and is absorbed by photosynthesis of plants. Fossil Fuels Fuels that are formed in the earth from plant or animal remains.
Examples are coal, oil, and natural gas.
The result of the greenhouse effect. It is the warming of the planet's atmosphere. Natural global warming is a result of the natural greenhouse effect and is what makes the planet hospitable to life. That is, sometimes it is used to refer to the warming that is a result of the enhanced greenhouse effect. The cause of global warming.