Species can't survive temperature change

Mark Urban : evoltuionary biologist
Falling into a third category are species that can't move to follow their preferred climate and are blocked from adapting, either by a local competitor that replaces them or because there's no variation for selection to work on. They'll be at risk to go locally extinct. Urban gives the example of species at the equator that are already adapted to the hottest temperatures on Earth. If this area warms, and no individuals are adapted to hotter than the hottest temperatures, the species will be at the mercy of processes that mix new variation into the population before most individuals die.

Life & Earth Science, "10 Predictions for Evolution Over the Next Million Years", [online], Available: http://science.discovery.com/life-earth-science/10-predictions-for-evolution.htm