Earth: a very brief history -- Mass extinctions: the first four of five -- Mass extinctions, continued: the fifth one got the dinosaurs -- Homo sapiens: not the only humans -- DNA bottleneck: that time humans almost went extinct -- Asteroids: incominggggg! -- Supervolcanoes: the blast from below -- Disease: teeny tiny threats like bacteria and viruses -- Overpopulation : we live here, we eat here-until we don't -- War: the ultimate self-destruct button -- Sun: we're gonna need stronger SPF -- Outer space: supernovae, gamma-ray bursts, aliens -- Global warming: who turned up the heat? -- 1.5-2° Celsius: just a wee bit warmer -- We're doomed (JK, how to save the people).
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