
NASA @NASA
Four years ago, @NASA_Langley's SAGE III instrument took its first measurements. SAGE II helped confirm human-driven changes to the ozone layer; SAGE III helps scientists monitor its recovery, after a reduction in emissions of ozone-depleting substances: https://t.co/hywpaPEefH https://t.co/4x2iGt2oZD — PolitiTweet.org