While nuclear power plants have gained some measure of support because they largely do not contribute to global warming, their need for massive amounts of cool water to keep reactors operating smoothly may force plants to cut back operations or break environmental rules in the future as rivers and reservoirs become heated or depleted. Nuclear power plants do not create carbon dioxide as do plants run on coal and natural gas, and countries including France and the U.S. already rely heavily on nuclear plants as a source of energy.

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