InsideClimate: The concentration of heat-trapping CO2 pollution in the atmosphere has passed the 400 parts per million (ppm) threshold in Antarctica for the first time in at least 800,000 years, and possibly as long as four million years, scientists reported this week.
The new measurements, reported by British and U.S. research stations, show that every corner of the planet is being affected by the burning of fossil fuels, according to British Antarctic Survey (BAS) scientists who track environmental changes...