Global warming is caused by several things, which include man-made or anthropogenic causes, and global warming is also caused by natural causes.
Natural Causes
Natural causes are causes that are created by nature. One natural cause is a release of methane gas from arctic tundra and wetlands. Methane is a greenhouse gas and a very dangerous gas to our environment. 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.
SOURCEhttp://www.causesofglobalwarming.net/the_causes.html
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