Carbon dioxide levels hit 50% higher than preindustrial time

  • This 2019 photo provided by NOAA shows the Mauna Loa Atmospheric Baseline Observatory, high atop Hawaii's largest mountain in order to sample well-mixed background air free of local pollution. Heat-trapping carbon dioxide levels in the air peaked in May 2021, in amounts nearly 50% higher than when the industrial age began and they are growing at a record fast rate, scientists reported Monday, June 7, 2021. (Susan Cobb/NOAA Global Monitoring Laboratory via AP)

The annual peak of global heat-trapping carbon dioxide in the air has reached another dangerous milestone: 50% higher than when the industrial age began.