And some people are still seriously talking about Trump being President? Geez talk about whistling past the graveyard.
Earth’s CO2 Passes the 400 PPM Threshold–Maybe Permanently
In the centuries to come, history books will likely look back on September 2016 as a major milestone for the world’s climate. At a time when atmospheric carbon dioxide is usually at its minimum, the monthly value failed to drop below 400 parts per million.