A Global Warming essay is a common task which many college students are expected to undertake. It is a pressing environmental issue which is affecting the whole world. Before beginning to write your essay, it is important to know what global warming is. It refers to the increase of average temperature on earth. As the Earth gets hotter disasters such as hurricanes, droughts and floods will increase and the melting of the polar ice caps will increase the sea levels resulting in the submerging of some of the small island nations that are not at high sea levels.