Billy Barr has been doing the same thing every day for half a century. He measures the snow outside his home in a remote part of the Rocky Mountains – keeping a record of the depth, weight and density. He started with just a notebook, but now all 53 years of his data is available online, and researchers are using it to track the impacts of climate change. Our producer Tara Cleary travels to Gothic, Colorado to meet the lone scientist who’s making a big impact  

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