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400 ppm: Carbon dioxide in the atmosphere reaches prehistoric levels
2013-05-10 16:00:00| Climate Ark Climate Change & Global Warming Newsfeed
Scientific American: On May 2, after nightfall shut down photosynthesis for the day in Hawaii, carbon dioxide levels in the atmosphere touched 400 parts-per-million there for the first time in at least 800,000 years. Near the summit of volcanic Mauna Loa--where a member of the Keeling family has kept watch since 1958--sensors measured this record through sunrise the following day. Levels have continued to dance near that benchmark in recent days, registering above 400 ppm for the first time in eons after midnight on...
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Atmospheric CO2 Concentrations Surpass 400 PPM Milestone In May 9 Daily Average
2013-05-10 13:35:00| Climate Ark Climate Change & Global Warming Newsfeed
Huffington Post: Atmospheric concentrations of carbon dioxide surpassed a notable milestone this week. They reached a daily average above 400 parts per million, reported NOAA, for the first time in human history. The milestone, hit on May 9, may be symbolic, notes Climate Central, but manmade CO2 emissions from the burning of fossil fuels continue to rise, bringing greater atmospheric warming and exacerbating the effects of climate change. Scientists argue we've loaded the "climate dice" in favor of more...
Tags: average
daily
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Earth's greenhouse gas levels approach 400 ppm milestone
2013-05-02 16:00:00| Climate Ark Climate Change & Global Warming Newsfeed
LA Times: 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. The Institution this week launched a daily Keeling curve update, showing the saw-toothed upward diagonal of rising carbon dioxide levels since the late 1950s. Isolated measurements have peaked at above 400 parts per million in the Arctic, but scientists are more alarmed at steady...
Global CO2 Levels Set to Pass 400 ppm Milestone
2013-05-01 17:31:00| Climate Ark Climate Change & Global Warming Newsfeed
Guardian: The concentration of carbon dioxide in the atmosphere has reached 399.72 parts per million (ppm) and is likely to pass the symbolically important 400 ppm level for the first time in the next few days. Readings at the U.S. government's Earth Systems Research laboratory in Hawaii, are not expected to reach their 2013 peak until mid-May, but were recorded at a daily average of 399.72ppm on April 25. The weekly average stood at 398.5 on Monday. Hourly readings above 400ppm have been recorded six...
All eyes on Keeling Curve: Scientists anxious as CO2 levels to cross 400 PPM
2013-05-01 16:00:00| Climate Ark Climate Change & Global Warming Newsfeed
InsideClimate: For the first time in human history, concentrations of carbon dioxide in the atmosphere are expected to pass 400 parts per million across much of the Northern Hemisphere in May, according to scientists who study data from the Mauna Loa Observatory, the world's longest-running CO2 monitoring station. While crossing the 400 ppm mark isn't a "tipping point" that signals climate catastrophe, scientists told InsideClimate News, it is an important symbolic milestone that underscores government inaction...
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