36 years of bike race footage reveals how Belgium’s climate is changing. The researchers watched more than 200 hours of video for races from 1981 to 2016, picking out 20 trees that they could see clearly in subsequent years.

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36 years of bike race footage reveals how Belgium’s climate is changing. The researchers watched more than 200 hours of video for races from 1981 to 2016, picking out 20 trees that they could see clearly in subsequent years.