To combat its carbon critics while also supporting its rapid growth and development, China decided to kill two birds with one stone and focus its energy on developing renewables — fast. In the first half of this year alone, China installed more than 3 GW of solar capacity, ramped up its offshore wind development, and invested billions in electric vehicle adoption. But despite this progress, China still has a long way to go, so in July it announced that it would open the door to a technology that has been mostly shut out of the country for more than a decade: geothermal.