11 startling stats about Earth's disappearing wildlife
October 27, 2016, 2:10 p.m. by Russell McLendon
Our planet has lost 58 percent of its vertebrate animals since 1970, but there is still time to save the rest.
Carbon dioxide in Earth's atmosphere just reached a major milestone
September 29, 2016, 9:36 a.m. by Russell McLendon
CO2 data from Mauna Loa in Hawaii suggest 400 ppm is the new normal.