Natural Causes
of Global Warming
Natural 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. Greenhouse gases are gases that trap heat in the earth's atmosphere. When heat is trapped within the earth�s atmosphere, it cannot escape and will heat up the earth gradually. Another natural cause is that the earth is going through a cycle of climate change. This climate change usually lasts about 40,000 years.