Credit: Pixabay/CC0 Public Domain For most countries around the world, sourcing energy entirely from wind, solar, geothermal, and hydropower by 2050 would reduce their energy needs and costs, improve air quality, and help slow climate change, according to a study in Environmental Science & Technology. These benefits, the authors say, could be realized at a fraction of the cost of implementing technologies that remove carbon dioxide (CO2) from the air and capture it from stationary emitters like ...