Are we among the final generations of humans to walk the earth? One Australian scientist says yes, and he’s not just another 2012 doomsday believer. Professor Frank Fenner, who announced the eradication of smallpox to the World Health Assembly in 1980, says overpopulation and climate change are just two of many reasons why humans won’t survive much more than a century into the future.

In fact, Fenner declines to speak about climate change because he believes there’s no use — our fate is sealed.

“Homo sapiens will become extinct, perhaps within 100 years,” he said in an interview with The Australian. “A lot of other animals will, too. It’s an irreversible situation. I think it’s too late. I try not to express that because people are trying to do something, but they keep putting it off.”

Thanks to the population explosion and “unbridled consumption”, Fenner says food wars and global droughts will intensify problems like malnutrition and poverty.

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