Over the last decade, renewable energy has roughly doubled. Solar, wind, hydro, and others grew by 161 GW in 2016. That’s an 8.7% increase in one year. At that rate, the next doubling will happen in less than nine years. No single source dominated, though solar was the greatest growth at 71 GW. Fossil fuels are losing the competition to the general idea of renewable energy; particularly as the economies of scale begin to work in favor of renewable energy equipment and against fossil fuel extraction. The more popular renewable energy gets, the greater its availability, and the lower the cost.