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The Greenhouse Gases
Almost all of the Earth's atmosphere (99%) is made up of nitrogen (about 78%) and oxygen (about 21%). While both of these gases play important roles in the vast number of processes that support life on Earth, they play almost no direct role in regulating the climate. This is carried out by some of the trace gases in the remaining 1% of the atmosphere which occur in relatively small amounts:
Although the proportion of the trace gases in the atmosphere appears relatively small, they can still have a big impact on climate change.
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