According to a 2016 study, the top contributor of air pollution-related deaths in China is the burning of coal. To improve the country's air quality, the Chinese government vows to spend at least $360 billion on clean energy projects and create 13 million new renewable energy jobs by 2020. This year marks China's fourth anniversary since it started a "war on pollution," and there's reason to believe the country is making headway. Chinese cities have cut concentrations of fine particulates - often considered the deadliest type of pollution - by 32% on average since 2013. The city of Xingtai saw the largest pollution decline at 52.2%. China's latest energy megaproject - a giant floating solar farm on top of a former coal mine in Anhui - may get the country closer to that goal. The 166,000-panel array ... can generate 40 megawatts of power - enough to accommodate 15,000 homes. It's currently the world's largest floating solar project and will operate for up to 25 years. Local energy company Sungrow Power Supply developed the farm on a lake that was once the site of extensive coal mining. After an explosion caused the mine to collapse, a lake formed and flooded it. Building solar plants on top of lakes and reservoirs can protect agricultural land and wildlife on the ground. The water also cools the solar panels, helping them work more efficiently. Choosing to develop the Sungrow farm on an abandoned coal mine signals the slow decline of fossil fuels like coal in China and other countries around the world.