Global warming means when the earth receives more than enough radiation from the sun and it leads to melting down of ice caps and polar regions, and its leads to flooding and drought in some part of the world. Release of carbon dioxide from man made machines helps destroy or deplete the ozone layer, which allows more harmful radiation from the sun to reach the surface of the earth. Green house gasses prevents heat from going back into space, there by warming the planet( making it hot) .