"If we cannot stop the building of more coal-fired power plants, those coal trains will be death trains -- no less gruesome than if they were boxcars headed to crematoria, loaded with uncountable irreplaceable species."
- James Hansen, Climate Scientist / Political Propagandist
Really though, humanity doesn't even need global warming to precipitate the next great mass extinction. Soon there will be 9 billion humans who are all hunting, farming, and ever encroaching on the few natural regions left on the planet. Climate change is the very least of other species' worries.