Posted: 07 May 2015 05:42 AM PDT
For the first time since we began tracking carbon dioxide in the global atmosphere, the monthly global average concentration of this greenhouse gas surpassed 400 parts per million in March 2015, according to NOAA’s latest results. …The International Energy Agency reported on March 13 that the growth of global emissions from fossil fuel burning stalled in 2014, remaining at the same levels as 2013. Stabilizing the rate of emissions is not enough to avert climate change, however. NOAA data show that the average growth rate of carbon dioxide concentration in the atmosphere from 2012 to 2014 was 2.25 ppm per year, the highest ever recorded over three consecutive years.
NOAA works with partners around the world to make sustained measurements of atmospheric gases. These data are used in analyses that aid our understanding of climate change and provide information to help decision-makers address the challenges facing our planet. NOAA bases the global carbon dioxide concentration on air samples taken from 40 global sites. NOAA and partner scientists collect air samples in flasks while standing on cargo ship decks, on the shores of remote islands and at other locations around the world. It takes some time after each month’s end to compute this global average because samples are shipped from locations for analysis at NOAA’s Earth System Research Laboratory in Boulder, Colorado. “We choose to sample at these sites because the atmosphere itself serves to average out gas concentrations that are being affected by human and natural forces. At these remote sites we get a better global average,” said Ed Dlugokencky, the NOAA scientist who manages the global network….
Published on May 7, 2015 3:06 AM
MIAMI (AFP) – In another ominous sign of human-caused climate change, US government scientists said Wednesday that global carbon dioxide concentrations have reached a new monthly record of 400 parts per million. Carbon dioxide is a potent greenhouse gas, and is a harmful by-product of burning fossil fuels such as oil and coal. “For the first time since we began tracking carbon dioxide in the global atmosphere, the monthly global average concentration of this greenhouse gas surpassed 400 parts per million in March 2015,” said the National Oceanic and Atmospheric Administration (NOAA). Scientists announced that C02 had passed the 400 ppm level for the first time in the Arctic in 2012, and at Mauna Loa in Hawaii in 2013….