Global warming means

gradual increase in the overall temperature of the earth's atmosphere generally attributed to the greenhouse effect caused by increased levels of carbon dioxide, chlorofluorocarbons, and other pollutants.

Answer: the world is slowly increasing in temperature

Explanation: greenhouse gasses make sure the heat in the earth from the sun can go in but not out. They make it kinda like an oven. We have too many greenhouse gasses in the atmosphere and it is making the world warmer