Column: How many people does it take to overpopulate Earth?

Oscar-winning filmmaker Jessica Yu’s population documentary “Misconception” asks how many people are really too many for planet Earth.

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MORE PATT MORRISON ASKS

Alan Alda on why scientific illiteracy is endangering the planet -- and how we can turn that around

Liberal gun groups? They're out there — and they have a different take on stopping gun violence than you might expect

Sex, love and murder -- 400 years after his death, Shakespeare still delivers the goods

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