of Science, the equilibrium created by the greenhouse gases helps to keep the earth's average temperature of 16 degree Celsius (Australian Academy of Science Online).
             The Earth's atmosphere is made up of 78 per cent nitrogen and 21 per cent oxygen. Only about 1 per cent is made up of natural greenhouse gases, but this comparatively small amount of gas makes a big difference. Before the industrial revolution (which started in England about 200 years ago) the mix of gases that made up the atmosphere was relatively constant. The industrial revolution along with some other factors brought new industrial processes, more extensive agriculture, and a rapid increase in the world's population. This rapid increase in human activity meant that more of
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