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... warmed up by over half a degree Celsius (°C). Also during this time humans have been releasing extra greenhouse gases, which are the result of burning fossil fuels (like coal, oil and gas). These gases include carbon dioxide, methane and nitrous oxide. It is thought that the man-made emissions of greenhouse gases, from the increased use of fossil fuels, are responsible for some of the global warming during the 20th century. The extra greenhouse gases in the atmosphere trap more energy and therefore enhance the natural greenhouse effect. Greenhouse gases are also released by the exhausts of motor vehicles, and by the cutting down of forests. The Green house effect is the rise in temperature that the Earth experiences because some gases in the atmosphere such as carbon dioxide, nitrous oxide and methane trap energy from the sun. These gases are known as the green house gasses, and these gasses ...