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  • Ocean acidification troubles Featured Article Ocean acidification troubles Ocean acidification troubles

    The seas in which corals and other calcifying species dwell are turning acidic, their pH slowly dropping as Earth's oceans acidify in response to increased carbon dioxide... More »

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U.S. carbon dioxide emissions from energy use fell in 2011 Last Updated on 2012-08-17 00:00:00 After an increase in 2010 of 3.3 percent, energy-related carbon dioxide emissions declined in 2011 by 2.4 percent and were 526 million metric tons (9 percent) below the 2005 level. Energy-related carbon dioxide emissions have declined in the United States in four out of the last six years. Main Image Credit: Vitaly Krivosheev-Fotolia. U.S. Energy-Related Carbon Dioxide Emissions, 2011 Release Date: August 14, 2012   |  Next Release Date: August 2013 U.S. carbon dioxide emissions from energy use fell in 2011 Read the Analysis After two years of declining carbon dioxide emissions (2008 and 2009) and one year of increasing emissions (2010), carbon dioxide emissions in 2011 fell, but at a less dramatic rate than in 2009. Unlike 2009, the 2011 decline occurred during a year of positive growth in the Gross Domestic Product... More »
Ocean acidification troubles Last Updated on 2012-08-09 00:00:00 The seas in which corals and other calcifying species dwell are turning acidic, their pH slowly dropping as Earth's oceans acidify in response to increased carbon dioxide in the atmosphere. Trouble in Paradise: Ocean Acidification This Way Comes Sustainability of tropical corals in question, but some species developing survival mechanisms The following Discovery article is part two in a series on the National Science Foundation's Science, Engineering and Education for Sustainability (SEES) investment. Visit parts one, three, four, five, six and seven in this series. The following is part five in a series on the National Science Foundation's Long-Term Ecological Research (LTER) Network. Visit parts one, two, three, four, six, seven, eight and nine in this series. Double, double toil and trouble; Fire burn, and caldron bubble. —Shakespeare,... More »
Carbon dioxide milestone in Arctic Last Updated on 2012-06-03 00:00:00 Carbon dioxide atmospheric concentrations at Barrow, Alaska, reached 400 parts per million this spring—the first time a monthly average measurement for the greenhouse gas attained the 400 ppm mark in a remote location. NOAA: Carbon dioxide levels reach milestone at Arctic sites NOAA cooperative measurements in remote, northern sites hit greenhouse gas milestone in April The concentration of carbon dioxide in the atmosphere of Barrow, Alaska, reached 400 parts per million (ppm) this spring, according to NOAA measurements, the first time a monthly average measurement for the greenhouse gas attained the 400 ppm mark in a remote location. Carbon dioxide (CO2), emitted by fossil fuel combustion and other human activities, is the most significant greenhouse gas contributing to climate change. “The northern sites in our monitoring network tell us what is... More »
Earth's Hot Past: Prologue to Future Climate? Last Updated on 2011-01-14 00:00:00 Earth's Hot Past: Prologue to Future Climate? Study of Earth's deep past leads to look into the future The magnitude of climate change during Earth's deep past suggests that future temperatures may eventually rise far more than projected if society continues its pace of emitting greenhouse gases, a new analysis concludes. The study, by National Center for Atmospheric Research (NCAR) scientist Jeffrey Kiehl, will appear as a "Perspectives" article in this week's issue of the journal Science. View a video interview with Jeff Kiehl of UCAR. The work was funded by the National Science Foundation (NSF), NCAR's sponsor. Building on recent research, the study examines the relationship between global temperatures and high levels of carbon dioxide in the atmosphere tens of millions of years ago. It warns that, if carbon dioxide... More »
Where We Are Now: Carbon Dioxide and the Hottest Years on Record Last Updated on 2010-12-19 00:00:00 Disagreements still remain about the extent to which the recent warming in global temperatures deviates from normal climatic cycles. Direct measurements of temperature have been available from weather stations around the world only since 1861. To reconstruct temperature patterns before 1861 requires the use of proxy measures, measurements such as the width of tree rings that are strongly correlated with temperature and can be dated with accuracy. In 1999, Michael Mann of Pennsylvania State University and his coworkers reconstructed the mean annual temperatures in the Northern Hemisphere over the last 1,000 years from a variety of direct measurements and proxy measures.  [1] The resulting graph became affectionately known as the “hockey stick” because the “shaft” (representing temperatures from 1000 to 1900 AD) was relatively straight, whereas the... More »