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I think there are 5 possible answers, ill put the more likely ones first.

*World War III (although it is unlikely that that would exterminate whole of humanity)

*Meteor hit (would kill millions on impact and billions in the years after, dust in the atmosphere from the hit would block sunlight, so everything would die) lucky that we got fossil fuels :) cause no more wind or sun.

*Epidemic of some kind of very aggressive virus

*Gamma flash (flash emitted from a black hole, can exterminate whole star systems at once). would blow away our atmosphere.

*Alien invasion if they don't come in peace and are a lot more advanced then us.

highly unlikely.

If you think i forgotten some, feel free to add them in the right order :)

**Thanks to Ernest Rutherford, nuclear warfare shall lay us all to rest :)

Good on ya Ernie! ;)

I think that the cause of WWIII will be overpopulation, water shortage and starvation. We are seeing the population explode from zero to under 500 million in 40,000 years to nearly 7 billion in the last 300 years and it will increase to probably 10 billion in the next 40 years. The earth and it's resources cannot sustain that growth, and humans are too greedy and selfish to do anything about it. Steven Hocking was right, the only chance humanity has of surviving earth is to find a way off it.

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14y ago

What else can I help you with?