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Global Warming is caused by many things. The causes are split up into two groups, man-made or anthropogenic causes, and natural causes.Natural CausesNatural causes are causes created by nature. One natural cause is a release of methane gas from arctic tundra and wetlands. Methane is a greenhouse gas. A greenhouse gas is a gas that traps heat in the earth's atmosphere. Another natural cause is that the earth goes through a cycle of climate change. This climate change usually lasts about 40,000 years.