Hundreds of millions of Indians live in poverty, wielding a tiny per-person carbon footprint when compared with residents of the West and coming out on top of environmental sustainability surveys. But the country is home to so many people that steady economic growth is turning it into a climate-changing powerhouse. It has developed a gluttonous appetite for coal, one of the most climate-changing fuels and the source of nearly two-thirds of the country’s power. India recently overtook Russia to become the world’s third-biggest greenhouse gas polluter, behind China and the United States. (If you count the European Union as a single carbon-belching bloc, then India comes in fourth).