According to the state-owned Costa Rican Electricity Institute (ICE), the country hasn't had to burn fossil fuels to supply the grid with electricity so far in 2015, a stretch that has never been previously attained by any nation.

Of course, we don't mean all of their energy has come from renewables as their vehicles, for example, still use fossil fuels, but what they have achieved is extremely laudable.

"The year 2015 has been one of electricity totally friendly to the environment for Costa Rica," the ICE said in a statement last week.

As reported by Think Progress, the country's clean streak is predominantly attributable to heavy rains experienced this year, which have kept four of the main hydroelectric power stations busy. In fact, these have been churning out so much energy that virtually all of 2015's electricity demands have been met through these plants, according to Quartz.