Whichever side of the subjective city-versus-rural debate you’re on, the objective laws of thermodynamics dictate that cities lose on at least one front: They tend to get insufferably hotter, more so than surrounding rural areas. 

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One in three large American rivers has changed color over the last 36 years, shifting from shades of blue to green and yellow, raising concerns about the health of U.S. waterways, according to an analysis of nearly 235,000 satellite images published in the journal Geophysical Research Letters.

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