Correlations: Where Renewable Energy Cuts Emissions the Most

The places where solar and wind power can really make a difference

Carnegie Mellon University researchers say solar and wind energy projects are most effective at reducing emissions when they lower local reliance on coal plants.

A solar panel in sunny Arizona might produce a lot of electricity, but building more of them brings diminishing returns as they replace relatively low-emission natural gas plants. Those same panels in coal-heavy Indiana or West Virginia, while less efficient, displace dirtier power.

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