competing for places at the top:

Asteroid hit
nuclear war
devastating anthropogenic climate change/disease/politics

Ultimately the sun will swell to a red giant and swallow all the inner planets, but that's not in my lifetime,...or even for another many many thousands of years.

The dinosaurs were the most successful species we'll ever see, in terms of longevity and sustaining the planet.
Mankind will probably the creator of its own demise

Edited by Forest Hillbilly (06 Feb 2019 8.02pm)

"The facts have changed", Rishi Sunak