Wednesday, January 28, 2009
The Earth has not always been like it is now
For most of its 4.5 billion years, the Earth is not some place you would want to live.
About half of that time, no oxygen.
Most of the time frozen in ice ages.
But for the last 10,000 years, the Earth's climate has been quite mild, probably because we cut down all the trees. Because there are only dry, academic records of what the Earth was like, and because it is so far out of living memory, no one can believe that it will not be like this forever.
A lot of carbon was sequestered underground millions of years ago. Then, in basically a single human lifetime, we unsequestered it and pumped all that carbon in the form of carbon dioxide back into the atmosphere. This was not a good idea.
http://www.newscientist.com/article/dn16490-human-emissions-could-bring-irreversible-climate-chaos.html
About half of that time, no oxygen.
Most of the time frozen in ice ages.
But for the last 10,000 years, the Earth's climate has been quite mild, probably because we cut down all the trees. Because there are only dry, academic records of what the Earth was like, and because it is so far out of living memory, no one can believe that it will not be like this forever.
A lot of carbon was sequestered underground millions of years ago. Then, in basically a single human lifetime, we unsequestered it and pumped all that carbon in the form of carbon dioxide back into the atmosphere. This was not a good idea.
http://www.newscientist.com/article/dn16490-human-emissions-could-bring-irreversible-climate-chaos.html
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