| http://www.w3.org/ns/prov#value | - The earth of 40 million years ago was a warm, wet place.^Forests abounded; grasslands and deserts were rare.^Then the planet began to cool.^Regional climate extremes developed.^Many causes have been postulated, including continental drift and diminishing atmospheric carbon dioxide.^The authors offer a new theory: continental uplift created huge plateaus that altered circulation of the atmosphere.^
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