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The Latin American country of Costa Rica has achieved an impressive milestone in green energy production by generating 100 per cent of its energy from renewable resources, with a combination of hydropower and geothermal for 75 days in a row. Thanks to the favorable rainy conditions in the first months of the year, four of Costa Rica’s hydropower plants — Arenal, Cachí, La Angostura and Pirrís — are generating nearly enough electricity to power the entire country. Using a mix of geothermal, solar, and wind energy sources, the nation of 5 million inhabitants hasn’t needed an ounce of coal or petroleum to keep the lights on since December of 2014.