The mean carbon dioxide measured at Mauna Loa Observatory, Hawaii in June 2021 was 418.94ppm. 418.94ppm If I am not mistaken, this is the highest concentration recorded since humans have been on earth? At least it is comforting to know that such existential issues are front-of-mind for our political leaders. You know, "follow-the-science" and all that... Source: NOAA 2021 I…