Richard Dawkins is a prominent evolutionary biologist and atheist.
In 2013 he said on "What do you think of Humanistic Religions and Transhumanism?":
There's nothing in principle impossible about extending the human life span for a very long time. Whether it's a good thing to do would be another matter, there would be ethical concerns about whether, if the present generation discovers how to live forever - now that means that there's no more reproduction - there better not be any more reproduction or y'know, the world will just become full of solid human flesh. So that particular ethical consideration would have to be taken care of. There's also the personal consideration, I'd quite like to live a bit longer than I'm going to, but somehow going on for millions of years, it'd probably get a bit boring
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