Battling Lava and Snowstorms to Keep a Climate Project Alive Ever since an eruption in Hawaii halted a long-running record of carbon dioxide, scientists have found ways to carry on — atop a neighboring volcano.
Carbon Dioxide Levels Are Highest in Human History Humans pumped 36 billion tons of the planet-warming gas into the atmosphere in 2021, more than in any previous year. It comes from burning oil, gas and coal.