What causes Global Warming?

Are planet's atmosphere allows light from the sun to pass through. Some light is absorbed by the earth's surface and converted into heat. Most of this heat radiates back into space, but some is trapped by greenhouse gases in the atmosphere. The most common greenhouse gases are water vapor(humidity), carbon dioxide, methane, and nitrous oxide. Greenhouse gases occur naturally and mack life on earth possible. Without them, the earth would be about 60F colder than it is today.