Discussion 3 ClimateChange.posted

Discussion 3 ClimateChange.posted - Greatest Warming Is in...

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Greatest Warming Is in the North, but Biggest Impact on Life Is in the Tropics, New Research Shows ScienceDaily (Oct. 7, 2010) — In recent decades documented biological changes in the far Northern Hemisphere have been attributed to global warming, changes from species extinctions to shifting geographic ranges. Such changes were expected because warming has been fastest in the northern temperate zone and the Arctic. The study focused on ectothermic, or cold-blooded, organisms . Researchers used nearly 500 million temperature readings from more than 3,000 stations around the world to chart temperature increases from 1961 through 2009, then examined the effect of those increases on metabolism.
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Small temperature changes can push tropical organisms beyond their optimal body temperatures and cause substantial stress, while organisms in temperate and polar regions can tolerate much larger increases because they already are used to large seasonal temperature swings. The scientists say the effects of warming temperatures in the tropics have largely been ignored because temperature increases have been much greater farther north and because so few researchers work in the tropics.
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The bristlecone pines are a small group of pine trees (Family Pinaceae, genus Pinus, subsection Balfourianae) that are thought to reach an age far greater than that of any other single living organism known, up to nearly 5,000 years. There are three closely related
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Discussion 3 ClimateChange.posted - Greatest Warming Is in...

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