The most serious threat is the rising global temperatures changing climate patterns around the world. Hotter environments can mean more discomfort for people in the tropics, and certain plant and animals species that thrive in those environments may die out. This can cause disruptions in food chains and in the global food supply. A second threat is the rising sea levels due to the melting of glaciers. This can cause certain low-lying cities to become uninhabitable in the near future, if water rises to a point where they cannot be lived in. The likelihood of floods disrupting governments and economies is also increased. A third threat is ocean acidification. Because there is more CO2 in the atmosphere, more of it dissolves into seawater as well, and the increased acidity changes living conditions for marine plants and animals. This can also disrupt the ocean ecological system.
