Showing posts with label Climate Change. Show all posts
Showing posts with label Climate Change. Show all posts

Thursday, January 19, 2012

Climate Change, Disbelief, and the Collision between Human and Geologic Time by Peter H. Gleick



Climate Change, Disbelief, and the Collision between Human and Geologic Time



Geologic time scales are long – too long for the human mind to really comprehend. Over millions, and tens of millions, and hundreds of millions of years, the Earth has changed from something unrecognizable to the planet we see on maps, plastic globes, and photos from space. The Atlantic Ocean didn’t exist eons ago and it will literally disappear in the future as the continental plates continue to move inch by inch. A visitor from outer space millions of years ago would have looked down upon land masses and land forms unrecognizable today. As John McPhee notes in his book, Assembling California, “For an extremely large percentage of the history of the world, there was no California.” Or North America, China, Australia, Hawai’i, Mt. Everest, Grand Canyon, or any of the other landforms and natural symbols we think of as immutable.

Wednesday, December 28, 2011

Over 65 Million Years, North American Mammal Evolution Has Tracked With Climate Change

ScienceDaily (Dec. 27, 2011) — Climate changes profoundly influenced the rise and fall of six distinct, successive waves of mammal species diversity in North America over the last 65 million years, shows a novel statistical analysis led by Brown University evolutionary biologists. Warming and cooling periods, in two cases confounded by species migrations, marked the transition from one dominant grouping to the next.
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