[null and void]

Or an asteroid strike, or a comet strike, or a rouge black hole, or a gamma ray burst,or a supernova, or a Higgs field reversal...Lots of possible candidates, all low probability, but high lethality. Mother Nature can be a B#tch...

Habitat destruction, monoculture, bitter harvest GMO crops, imported invasive species, zoönotic diseases and parasites, pollution. We can be real b#ast#rds, too!

[Kozak]

almost nothing we do, short of an all out nuclear war is like to cause our extinction. Mother Nature has a lot more strings for her bow.