Bjorn Lomborg studies solutions for the world’s biggest problems. He says we should spend on the “best things first.”

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I asked people on the street in New York how they’d spend money to help the world.

Fixing climate change was the most common answer.

Lomborg agrees that climate change is a problem that may threaten our kids someday.

But he also says, “if you live most other places on the planet, you’re worried about the fact that your kids might die from easily curable diseases tonight.”

Lomborg has a cheaper plan that would save millions of lives.