Yevecomp
The Climate In Historical Times
The Climate In Historical Times > http://bit.ly/1qXI1LQ
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Engber, D. In contrast to its uncertain beginning, there is a consensus that the Little Ice Age ended in the mid-19th century. Temperature records from thermometers and weather stations exist only for a tiny portion of our planet's 4.54-billion-year-long life. PMID11326091. However, it has been difficult to determine whether these warmer intervals were actually hotter or colder than occurred during the Cretaceous optima. Nature 407 (6806): 859869. (May 2015) (Learn how and when to remove this template message) . Summary for Policymakers. ^ Royer, Dana (23 March 2014).
Image from teaching slides available at SnowballEarth.org. "Ecosystem Collapse in Pleistocene Australia and a Human Role in Megafaunal Extinction". Paleoceanography 20 (2): PA2007. Reconstruction of the past 5 million years of climate history, based on oxygen isotope fractionation in deep sea sediment cores (serving as a proxy for the total global mass of glacial ice sheets), fitted to a model of orbital forcing (Lisiecki and Raymo 2005)[2] and to the temperature scale derived from Vostok ice cores following Petit et al. For a discussion of recent human involvement in climatic changes, see Attribution of recent climate change. Roughly 4 such cycles have occurred during this time with an approximately 140 million year separation between climate optima. Contents 1 Techniques of historical climatology 2 Evidence of climatic variations 2.1 Human record 3 Little Ice Age 4 Evidence of anthropogenic climate change 5 See also 6 References 7 External links . Climate change during the last 65 million years. Bibcode:2005PalOc.20.2007L.
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by Yevecomp on 2016-05-30 01:22:24
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