I don't think scientists can ...

I don't think scientists can dictate from above what we should do, because it's not a matter of scientific decision. If you want to have everybody living like a Beverly Hills millionaire, then 2 billion people might be too many. If we want to have a battery-chicken kind of world, with everybody having an absolute minimum diet, you might be able to support 10 billion.
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 Paul R. Ehrlich

Quotes from the same author

The mother of the year should be a sterilized woman with two adopted children
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 Paul R. Ehrlich
There are substitutes for oil; there is no substitute for fresh water.
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 Paul R. Ehrlich
Stanford may be the best university in the world, but you can get all the way through here without knowing where your food came from, without being able to say where we came from, without being able to give a coherent description of why the climate is changing and why we should be concerned about it. So I started teaching a course in human evolution and the environment that's open to all Stanford students, no prerequisites.
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 Paul R. Ehrlich
Woman should have the choice whether to have an abortion or not, but I like what Bill Clinton said: It ought to be safe and rare. You don't want to offend people with it. You try and do as much as you can to let people be different, but also to try and protect them from things that they think are bad. And it's worth all of us giving a little.
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 Paul R. Ehrlich
The National Academy of Sciences would be unable to give a unanimous decision if asked whether the sun would rise tomorrow.
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 Paul R. Ehrlich