California, US is currently facing a severe drought and so the people over there collectively came forward, to preserve the water of their state.
 
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The Los Angeles Department of Water and Power rolled out thousands of small, black plastic balls to protect water quality by preventing sunlight-triggered chemical reactions, deterring birds and other wildlife, and protecting water from rain and wind-blown dust.

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The black plastic balls will be used as the floating covers, to reduce the water evaporation in the reservoirs. Watch the video below for a better understanding of what the people have exactly done.

By Phani