At first, most people did not know what global warming was and what it meant. Little by little, we were left with no choice but to find out all about global warming and the effects it has been having all around the globe. Some animals, including polar bears, are now considered endangered animals thanks to global warming. Temperatures have risen and dropped drastically as well, which has negative effects on the environment, animals, and people as well. In fact, if the climate continues to change drastically, there may be mass migrations from poor countries and this can cause a serious security risk since it can lead to a breeding opportunity for terrorists.