Global warming causes an increase or decrease in temperature, so eventually those animals who live in cold environments (like the snow leopard, polar bears, puffins, etc) will experience a rise in temperature. Since the animal is not used to this weather, it may make the animals stressed, plus warmer weather would ruin their environment, the snow may melt and the ice would crack (depending on how warm it gets) and the animals will end up having to either leave, due to the drastic changes taking place, or will adventure on trying to battle the consistent changes in weather.
