If you ever pass through Finland’s Helsinki-Vantaa airport, you’ll probably run in to Petteri Räisänen. He doesn’t work at a security checkpoint, nor is he a pilot. He’s not even a jet-setting business traveler, but he’s always at the gate or sitting in an airport lounge.

He’s a frequent flier — but only for the fun of it.

Räisänen, a software engineer, has flown more than 530,000 miles over the course of 1,008 flights. That’s the equivalent of two solid months on an airplane, traveling the distance to the moon 2.218 times. Sure, a lot of Up In The Air-style business travelers surpass those...

Set a place at the table for climate change; hotter weather may have already taken a bite out of food crops worldwide.

The researchers tracked...