The extinction risk of global warming is the risk species have of becoming extinct due to the effects of global warming. Many species are under threat, and when considered together this can be considered to be a potential mass extinction. Human extinction has also been predicted as an effect of global warming, although the adaptability of humans to widely varying climatic conditions reduces the risk of extinction compared to that of other species. James Lovelock has predicted only a 90% reduction in human populations due to global warming.