Is the answer to do nothing?
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Scientists from the National Oceanic and Atmospheric Administration (NOAA) and Scripps Institute of Oceanography at the University of California, San Diego working at NOAA's Mauna Loa Atmospheric Baseline Observatory in Hawaii
said the May measurements—an increase from 417 parts per million (ppm) in May 2020—mean that "the atmospheric burden of CO2 is now comparable to where it was during the Pliocene Climatic Optimum, between 4.1 and 4.5 million years ago, when CO2 was close to, or above 400 ppm."
"The solution is right before our eyes. Solar energy and wind are already cheaper than fossil fuels and they work at the scales that are required. If we take real action soon, we might still be able to avoid catastrophic climate change." —Pieter Tans, NOAA