@CNN: Carbon dioxide (CO2), the No. 1 greenhouse gas leading to man-made global warming, has reached the highest concentration ever recorded on top of Hawaii’s Mauna Loa Observatory, where direct measurements have been taking place for more than 60 years https://t.co/V1QoT6KwbN https://t.co/LbgzpgFJyq

@CNN: Carbon dioxide (CO2), the No. 1 greenhouse gas leading to man-made global warming, has reached the highest concentration ever recorded on top of Hawaii’s Mauna Loa Observatory, where direct measurements have been taking place for more than 60 years https://t.co/V1QoT6KwbN https://t.co/LbgzpgFJyq