According to research conducted by the Carbon Disclosure Project, over a hundred major cities got 70 percent of their energy from renewables in 2017. The same year, Costa Rica spent 300 days running entirely off renewables, and other countries aren’t that far behind. In total, 8 percent of the world’s electricity now comes from solar and wind, and it costs less to build a new wind farm or solar plant than it does to operate an existing coal plant.
