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Politics : The Environmentalist Thread -- Ignore unavailable to you. Want to Upgrade?

To: Brumar89 who wrote (25380)	10/4/2009 11:16:12 AM
From: Wharf Rat	Read Replies (2) \| Respond to of 36921

"Sequoia trees would only show rainfall variation, not temperature changes." Are they unique, or do you need to read for another 4 years before you can back up your claim of understanding all this? "Besides no such study would be published anywhere" LMAO. *Tree Rings and the Climate* At Tucson they’ve built a chronology of tree rings from pencil width cores taken from the bristle cone pines in the White Mountains and the giant sequoias in the Sierra Nevada Mountains. These trees are some of the oldest on earth. One calendar that the lab put together of bristle cone pines went back 9,000 years. . books.google.com By comparing modern climate and tree-ring records, equations can be developed that allow long tree-ring chronologies to be used for estimating past climate variability, sometimes over thousands of years. Two summer temperature records are show here, one representing northern Fennoscandia and the other the area of the Polar Ural Mountains in Siberia. The data are smoothed to accentuate decadal and longer-timescale variations In recent years it has been in the area of climate reconstruction that the CRU has concentrated its efforts and produced a range of results that include regional average records of summer temperatures, extending over more than 1000 years, in both Northern Fennoscandia and the northern Urals and detailed spatial maps of temperatures for several centuries across northwest Europe, the western United States and northern North America. cru.uea.ac.uk Tree Rings Show Rising Earth Temperatures (Note to editors: Color images, showing scientists coring trees in Mongolia and cross sections of tree rings, are available by calling Laurence Lippsett, above, or via the World Wide Web at ldeo.columbia.edu.) Scientists at Columbia University's Lamont-Doherty Earth Observatory today reported new evidence from tree rings that temperatures on Earth have risen steadily since the late 1800s to unusual heights. columbia.edu hcn.org