Carbon dioxide in the atmosphere just set a new, 800,000-year record
Carbon dioxide in the atmosphere increased a record amount from 2015 to 2016, leaving the air laden with a concentration of the potent greenhouse gas not seen for at least the last 800,000 years, the period for which we have direct measurements from ice cores. The increase essentially guarantees that in the absence of rapid and dramatic cuts to emissions, catastrophic temperature increases “well above” those the Paris agreement sought to avoid will become a reality by end of the century, according to Petteri Taalas, the head of the World Meteorological Organization.
According to a report released by the international climate observing body on Monday (Oct 30), the concentration of CO2 was at 403.3 parts per million as of 2016, up from 400 parts per million a year earlier. That 3.3 ppm rise is 50% more than the average rate over the past decade. Over the last 70 years, the rate of increase of carbon in the atmosphere has been “nearly 100 times larger than at the end of the last ice age,” the last time the Earth transitioned to a much warmer world, the WMO writes. As far as the global scientific community can tell, “such abrupt changes in the atmospheric levels of CO2 have never before been seen.”
Such rapid increases in greenhouse gases “have the potential to initiate unpredictable changes in the climate system, because of strong positive feedbacks, leading to severe ecological and economic disruptions,” according to the report.
