This article discusses the new milestones reached by GHGs.
arbon dioxide (CO2), the No. 1 greenhouse gas leading to man-made global warming, has reached a dubious new milestone.
The level of the gas in the atmosphere, which is measured by instruments on top of Hawaii’s Mauna Loa Observatory, topped 410 parts per million (ppm) for the month of April.
This is the highest concentration of the heat-trapping gas ever recorded at the Observatory, where direct measurements have been taking place for more than 60 years, giving us the longest detailed record.