Getting back to around 350 ppm is required for a safe climate to sustain life as we know it on Earth. The last four years were the four hottest on record and, in spite of the Paris deal and increasing public awareness of the problem, mankind continues to break its own emissions records, year on year.
The Mauna Loa Observatory in Hawaii, which has tracked atmospheric CO2 levels since the late 1950s, on Saturday morning detected 415.26 parts per million (ppm)….
The last time Earth’s atmosphere contained this much CO2 was more than three million years ago, when global sea levels were several metres higher and parts of Antarctica were blanketed in forest.
“It shows that we are not on track with protecting the climate at all. The number keeps rising and it’s getting higher year after year,” Wolfgang Lucht, from the Potsdam Institute for Climate Impact Research (PIK), told AFP. It was also the first time on record that the observatory measured a daily baseline above 415 ppm….
….The 2015 Paris Agreement calls on humanity to block the rise in Earth’s temperature at “well below” 2 degrees Celsius (3.6 Fahrenheit) compared to preindustrial levels, and 1.5C if possible. ….Earth’s average surface temperature has already increased 1.0C since pre-industrial times due to man-made emissions.