One cause:

This time I will talk about how Greenhouse gases cause bad effects on global warming. Fist, the Greenhouse gases cannot go exposed from the atmosphere, so we can say that those gases acting like a mirror because when they reach to the atmosphere, they reflect to the earth. The problem is that the most heat energy is reflected back to the earth, this energy comes by carbon dioxide. The percentage of carbon dioxide in the earth has been increased in the last 50 years, and this is bad for the environment so we should do something. We should reduce our production of carbon dioxide.