Answer: Zero
For the last 82 days, Costa Rica has powered itself using only renewable energy sources.
That means the Latin American country hasn’t had to use fossil fuels at all so far in 2015.
Last week, the Costa Rican Electricity Institute (ICE) announced that 100 percent of the country’s electricity came from renewables for the first 75 days of the year, as heavy rains boosted the country’s hydroelectric power plants.
Wind, solar, biomass and geothermal energy have also helped power the country.
Granted, Costa Rica has an abundance of rivers, waterfalls, wind, and geothermal… uh… volcanoes — all of which can serve as clean energy.
But it certainly is possible. (In the United States, about 67% of the electricity generated is from fossil fuel [coal, natural gas, and petroleum])