If you fill a clear glass with lake water, chances are that the water has a slight yellow or brown color. The color is caused by dissolved organic carbon – a group of carbon compounds that wash into a lake from the soils around it when it rains or when snow melts. Dissolved organic carbon concentrations are increasing in lakes around the planet, in part because of climate change, but also due to other factors like reductions in acid rain. This causes the lake water to transition from relatively clear to a darker brown color.
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