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Tuesday, August 10, 2010
Marc Thiessen on Waterboarding
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Notes From the Bee Keeping Front
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Monday, August 9, 2010
NOAA Confirms Presence of Global Warming
Tuesday, December 1, 2009
Oceans Absorb Less Carbon Dioxide as Marine Systems Change
- Mixing Up Greener Cement
November 12, 2009 11:16 AM - $30.6M in Stimulus Funds Give US Hydroelectric Projects a New Spark
November 5, 2009 09:28 AM - Business Execs Plan to Boost Clean-Tech Investments Next Year
November 9, 2009 09:21 AM - Clean Energy Legislation Will Boost US Manufacturing Jobs
November 5, 2009 10:21 AM
The oceans are by far the largest carbon sink in the world. Some 93 percent of carbon dioxide is stored in algae, vegetation, and coral under the sea. But oceans are not able to absorb all of the carbon dioxide
The study, published in the current issue of Nature, is the first to quantify the perceived trend that oceans are becoming less efficient carbon sinks. The study team, led by Columbia University oceanographer Samar Khatiwala, measured the amount of human-caused carbon dioxide emissions pumped into the oceans since 1765.
Industrial carbon dioxide emissions have increased dramatically since the 1950s, and oceans have until recently been able to absorb the greater amounts of emissions. Sometime after 2000, however, the rise in emissions and the oceans' carbon uptake decoupled. Oceans continue to absorb more carbon, but the pace appears to have slowed.
The reason is based in part on simple chemistry. Increased concentrations of carbon dioxide have turned waters more acidic, especially nearer to the poles. While carbon dioxide dissolves more readily in cold, dense seawater, these waters are less capable of sequestering the gas as the ocean becomes more acidic. The study revealed that the Southern Ocean, near Antarctica, absorbs about 40 percent of the carbon in oceans.
Article continues: http://www.worldwatch.org/node/6323
Friday, September 4, 2009
Ribbon Seal Protection Sought by Activists
- New protections eyed for ice-dependent Alaska seals
March 27, 2008 07:50 AM - U.S. environmental group seeks protection for walrus
February 8, 2008 06:49 AM - Environmental groups sue to protect Alaskan bird
December 19, 2007 09:34 PM - Groups Sue to Protect Polar Bears
December 16, 2005 12:00 AM
Ribbon seals should be listed as threatened or endangered because global warming is quickly melting sea ice, which the seals depend on for several months each year, two environmental groups said in a lawsuit filed against the federal government in San Francisco Thursday.
The National Oceanic and Atmospheric Administration in December denied a listing under the Endangered Species Act for the seals found off the coasts of Alaska and Russia.
The Center for Biological Diversity and Greenpeace sued in U.S. District Court, claiming the agency ignored the best science available on global warming.
Climate-change technology risks 'catastrophic' outcome
- June 17, 2009 07:23 AM
Risky and unproven climate-changing technologies could have "catastrophic consequences" for the earth and humankind if used irresponsibly, according to a new report.
Yet without drastic further cuts in carbon dioxide emissions, a geoengineering solution may offer the only hope of saving the world from disastrous run-away global warming, experts warned.
A report by the Royal Society, Britain's leading academic institution, looks at the feasibility and potential dangers of technologies designed to cool the earth.
They include artificial "trees" that suck carbon dioxide out of the air, and spraying sulphate particles high in the atmosphere to scatter the sun's rays into space. The scientists concluded that, although some approaches were possible, they had not yet been properly researched and posed serious potential dangers for the planet.
Professor John Shepherd, who chaired the Royal Society geoengineering working group, said: "It is an unpalatable truth that unless we can succeed in greatly reducing carbon dioxide emissions we are heading for a very uncomfortable and challenging climate future, and geoengineering will be the only option left to limit further temperature increases."
"Our research found that some geoengineering techniques could have serious unintended and detrimental effects on many people and ecosystems — yet we are still failing to take the only action that will prevent us from having to rely on them."
Abrupt reversal detected in Arctic cooling trend
David Perlman, Chronicle Science Editor
The Arctic climate has been warmer over the past decade than during any 10-year period in 2,000 years, according to a study by an international research team that adds powerful new evidence that human-generated greenhouse gases have speeded the pace of the planet's recent warming.
The report from an international team of climate scientists concludes that climate change in the Arctic has accelerated since the Industrial Revolution, abruptly reversing a long-term worldwide cooling trend.
"The study provides a clear example of how increased greenhouse gases are now changing our climate," said Caspar Ammann of the National Center for Atmospheric Research in Boulder, Colo., a co-author of the report published Thursday in the journal Science.
To deduce the Arctic's decade-by-decade climate trend over the centuries, the leading scientists in the international study analyzed sediment cores in 14 Arctic lakes that revealed the varied growth rates of long-buried plants. They also studied Arctic tree rings to determine their growth rates and ages as well as ice cores from glaciers across the Arctic that showed patterns of relative warm and cold.
Researchers at other institutions, seeking to look for patterns of climate change even further back in time, used astronomical records to study the well-known wobble of the globe as it spins on its axis. They found that the Northern Hemisphere has long been moving away from the sun's warmth. During the summer solstice, the Northern Hemisphere is now a million kilometers - about 621,000 miles - farther away from the sun than it was 2,000 years ago, according to the scientist's computer models.
The result was a global period of relative cold that would have continued, the scientists found. But about 1850, at the beginning of the Industrial Age, the planet's climate began overcoming the cooling trend, and the Arctic climate has warmed decade by decade ever since as greenhouse gas emissions have increased, the scientists say.
Stephen Schneider, a Stanford climate expert and biologist who did not participate in the study, called the seven-year study, involving seven major research institutions in three nations, "a heroic effort."
The study, he said, "shows that nature has been, unfortunately, cooperating with theory and showing us on a long-time scale of millennia that the mainstream view is once again bolstered."
It is clear again, Schneider said, that anthropogenic influences - the increasing emission of greenhouse gases into the Earth's atmosphere - are the prime cause of global warming.
For the rest of the article go to:
http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2009/09/04/MNB219HIRT.DTL&tsp=1