International Business Times - The concentration of carbon dioxide (CO2), one of the most harmful greenhouse gases on our planet, touched record high last month.
According to the recent set of observations taken at the Mauna Loa Observatory in Hawaii, world's oldest continuous CO2 monitoring station, the concentration of the gas in our atmosphere went up to a whopping 410.31 parts per million (ppm) in the month of April.
Following the update on CO2 levels, Katharine Hayhoe, a climate scientist at Texas Tech University, expressed concerns over global warming in a tweet.
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