The atmospheric concentration of carbon dioxide is nearly 400 parts per million (ppm) and will soon pass that symbolically important level at the Hawaiian Mauna Loa station, where such measurements reflect the global average, reports John Vidal at the UK Guardian. The site, isolated from major pollution, is the most trusted monitor, and has measured carbon dioxide’s increase for 50 years. “I wish it weren’t true but … At this pace we’ll hit 450ppm within a few decades,” said Ralph Keeling, a geologist with the Scripps Institution of Oceanography which operates the Hawaiian station. Meanwhile, countries resumed deadlocked UN climate talks in Bonn. No global agreement to reduce emissions is expected to be reached until 2015. “The 400ppm threshold is a sobering milestone, and should serve as a wake up call for all of us to support clean energy technology and reduce emissions of greenhouse gases, before it’s too late for our children and grandchildren,” said Tim Lueker, a Scripps oceanographer and carbon cycle researcher.The last time CO2 levels were so high was probably 3 to 5 million years ago, when Earth’s climate was much warmer than today.
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Global carbon dioxide levels set to pass 400ppm milestone. The concentration of carbon dioxide in the atmosphere has reached 399.72 parts per million (ppm) and is likely to pass the symbolically important 400ppm level for the first time in the next few days. The Guardian http://www.guardian.co.uk/environment/2013/apr/29/global-carbon-dioxide-levels
Earth’s greenhouse gas levels approach 400 ppm milestone. The ratio of carbon dioxide in Earth’s atmosphere is flirting with 400 parts per million, a level last seen about 2.5 million to 5 million years ago, according to the Scripps Institution of Oceanography at UC San Diego. Los Angeles Times
Global CO2 Levels Set to Pass 400 ppm Milestone climate central
All eyes on Keeling Curve: Scientists anxious as CO2 levels to cross 400 PPM. Concentrations of carbon dioxide in the atmosphere are expected to pass 400 parts per million across much of the Northern Hemisphere this month, a symbolic milestone that underscores government inaction on global warming. Inside Climate News
Greenhouse gas levels highest in 3m years. Carbon dioxide concentrations in the Earth’s atmosphere are on the cusp of reaching 400 parts per million for the first time in 3 million years. The daily CO2 level, measured at the Mauna Loa Observatory in Hawaii, was 399.72 parts per million last Thursday. Western Australia Today
April 30 News: Global CO2 Levels Will Soon Pass 400 PPM … But Wasn’t Obama Hilarious At WH Correspondents’ Dinner? Cute co2 danger sign graphic – save it…