Earth
See also: Runaway climate changeEarth's climate has swung repeatedly between warm periods and ice ages during its history. In the current climate the gain of the positive feedback effect from increased atmospheric water vapor is well below that which is required to boil away the oceans. Climate scientist John Houghton has written that " is no possibility of runaway greenhouse conditions occurring on the Earth". However, climatologist James Hansen disagrees. In his Storms of My Grandchildren he says that burning coal and mining shale oil will result in runaway greenhouse on Earth.
Benton and Twitchett's have a different definition of a runaway greenhouse; events meeting this definition have been suggested as a cause for the Paleocene-Eocene Thermal Maximum and the great dying.
Read more about this topic: Runaway Greenhouse Effect
Famous quotes containing the word earth:
“Thus it seemed that this one hillside illustrated the principle of all the operations of Nature. The Maker of this earth but patented a leaf. What Champollion will decipher this hieroglyphic for us, that we may turn over a new leaf at last?”
—Henry David Thoreau (1817–1862)
“Allow me, whom Fortune always desires to bury, lay down my life in these final trivialities. Many have freely died in longlasting loves, among whose number may the earth cover me as well.”
—Propertius Sextus (c. 50–16 B.C.)
“You mean that this little pebble’s been out there hot-roddin’ around the universe?”
—Theodore Simonson. Irvin S. Yeaworth, Jr.. Mooch, The Blob, examining the “meteor” that carried the Blob to earth (1958)