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The Tokyo Olympics in 2020 will be much hotter than people think, according to a journalist who's been writing about the games since Japan won the contest to host them.

Jake Adelstein lives in Tokyo and writes for the Japan Times and The Daily Beast.

We heard disaster stories about both London and Rio yet they both worked out fine.

This time it's the weather that could be against the athletes rather than anything else.

(Photo: Sumo wrestlers Credit: Getty)