The Drilldown: California, NASA use satellite data to track GHGs Post author By Mark Post date April 16, 2021 The Drilldown: California, NASA use satellite data to track GHGs. By iPolitics. Published on Apr 16, 2021 10:59am. read more ← Hubble Watches Cosmic Light Bend → NASA to Announce Selection of Human Lander for Artemis Moon Mission