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So You Think You Know Renewables? Take the Quiz

Shining solar cells, whirling wind turbines, massive dams and advanced geothermal heat pumps are all crucial pieces of infrastructure that currently generate renewable energy. And they'll likely play a big role in the future as the world looks to slash carbon dioxide emissions.

But these seemingly new technologies each had humble beginnings many years ago. In fact, it may surprise you just how many years ago. Go ahead and test your renewable energy expertise by guessing their birth years below.

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