“As world leaders gathered across the globe this month to discuss a climate crisis that is rapidly heating the Earth, Billy Barr, 71, paused outside his mountainside cabin to measure snow. His tools were simple, the same he’d used since the 1970s. A wooden ruler plunged into white flakes accumulating on his snow board — an old freezer door affixed to legs of plastic piping and wood — showed two inches.” WaPo: He spent almost 50 years alone at 10,000 feet. His hobby helped shape climate research in the Rockies.