Global warming or climate change. A major problem in our world today. Observed global temperature increases. The main cause of the problem is caused by greenhouse gases. Greenhouse gases are important to the world because of carbon dioxide or methane to keep some heat in the world that does not reflect back into the atmosphere at all. Otherwise, the whole world is like the moon. Cold, very hot during the day and at night because of the atmosphere to filter the power from the sun. Which makes the world warmer