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A new study published recently in the journal Science shows that as the climate gets warmer, it is affecting the flows of rivers around the world. The water cycle is getting accelerated, leading to both more flooding and more droughts. That affects the flow of rivers, since flooding overtops the banks, while droughts leave very low flows. Both extremes affect the ecosystems of the streams and make it more difficult for those ecosystems to thrive. You can read more about how they did their study and what they found in EarthSky here.

Little River Falls in drought, October 2016. Source: WBRC.