Synopsis: How smart are we as a civilization? Smart enough to control our own destiny and avoid the cataclysms that could end life as we know it? Using state-of-the-art computer-generated graphics and interviews with the world's top scientists, Last Days On Earth takes viewers inside seven of the deadliest threats to humanity. Some have the power to render us extinct, others can destroy the planet; all could entail the end of our civilization. How likely are they to occur, what exactly would happen if they did, and could we survive?