Figure 1. Global temperature (degrees Celsius) and CO2 (ppm) 1860-2019.
Caption: “Atmospheric carbon dioxide continued its rapid rise in 2019, with the average for May peaking at 414.7 parts per million (ppm). That’s not only the highest seasonal peak recorded in 61 years of observations on top of Hawaii’s largest volcano, but also the highest level in human history and higher than at any point in millions of years” (NOAA.gov 2020).
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