Based on fossil data from a wide range of locations, scientists have reconstructed the climate history of the past 11,000 years, that is, since the last Ice Age, reports Tim Radford at the Climate News Network, and the conclusions are sobering. The new study, published in the journal Science, has concluded that by 2100 global temperatures will be higher than any time since then. Data indicate that for the first 5,000 years of that time, the world warmed a little over 1 degree Fahrenheit. Then over the next 5,000 plus years, it proceeded to cool slightly over 1 degree Fahrenheit, up until the Industrial Revolution. Cooling was caused by changes in Earth’s orbit and rotational axis, which cooled the North Atlantic about 4 degrees Fahrenheit as less sunlight hit the northern hemisphere. And we would still be cooling, if not for the burning of fossil fuels. Over the past 100 years or so, the burning of fossil fuels has warmed the Earth about 1 degree Fahrenheit. That is, the Earth is warming about 50 times faster than it has anytime since the Ice Age or the dawn of human civilization.
Join the swelling numbers of voters TELLING Congress they’ll vote for Clean Energy candidates here: http://signon.org/sign/we-are-the-clean-99?source=c.em.cp&r_by=487176 . This is an ongoing campaign (the next Congressional election is in 2 years!) so please, spread the word. It’s our way of telling Congress that a strong clean energy voting bloc is out there. This is how YOU can make a difference.
Why we should be cooling, not warming. March 7, 2013 in Warming. http://www.climatenewsnetwork.net/2013/03/why-we-should-be-cooling-not-warming/
original study: S. A. Marcott, J. D. Shakun, P. U. Clark, A. C. Mix. A Reconstruction of Regional and Global Temperature for the Past 11,300 Years. Science, 2013; 339 (6124): 1198 DOI: 10.1126/science.1228026