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:
“Under the one word “house” are included the schoolhouse, the almshouse, the jail, the tavern, the dwellinghouse; and the meanest shed or cave in which men live contains elements of all these. But nowhere on the earth stands the entire and perfect house.”
—Henry David Thoreau (1817–1862)
“Parched body, hollow eyes, some uncouth thing
Made him appear, long since from earth exiled.”
—William Drummond, of Hawthornden (1585–1649)
“When he painted a road, the roadmakers were there in his imagination. When he painted the turned earth of a ploughed field, the gesture of the blade turning the earth was included in his own act. Wherever he looked he saw the labour of existence; and this labour, recognized as such, was what constituted reality for him.”
—John Berger (b. 1926)