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Wyzwania XXI wieku


“Seven years ago, we made the single biggest investment in clean energy in our history. Here are the results. In fields from Iowa to Texas, wind power is now cheaper than dirtier, conventional power. On rooftops from Arizona to New York, solar is saving Americans tens of millions of dollars a year on their energy bills, and employs more Americans than coal — in jobs that pay better than average. We’re taking steps to give homeowners the freedom to generate and store their own energy. . . . Meanwhile, we’ve cut our imports of foreign oil by nearly sixty percent, and cut carbon pollution more than any other country on Earth.”
-Source: President Barack Obama, State of the Union address, 2016
The excerpt most directly reflects the United States’s efforts to do which of the following?
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