Smoke and steam rise from towers at the coal-fired Urumqi Thermal Power Plant in Urumqi in western China's Xinjiang Uyghur Autonomous Region on April 21, 2021. Global carbon pollution this year has bounced back to almost 2019 levels, after a drop during pandemic lockdowns. A new study by climate scientists at Global Carbon Project finds that the world is on track to put 36.4 billion metric tons of invisible carbon dioxide. (AP Photo/Mark Schiefelbein, File)