Can you put a price on pollution? Some of the world's biggest economies are doing just that as they wrestle with how to make good on grand pledges to tame planet-warming emissions.
President Xi Jinping's pledge that China will achieve carbon neutrality before 2060 is the most significant climate policy move for years and, if achieved, could curb likely global warming by 0.2-0.3 Celsius this century, researchers said.
