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:
“Still they stood,
A great wave from it going over them,
As if the earth in one unlooked-for favor
Had made them certain earth returned their love.”
—Robert Frost (1874–1963)
“Oh sure, everyone goes back to the earth at some point, but life itself is a thread that is never broken, never lost. Do you know why? Because each man makes a knot in the thread during his lifetime: it is the work he has done and that’s what gives life to life in the long stretch of time: the usefulness of man on this earth.”
—Jacques Roumain (1907–1945)
“Russian forests crash down under the axe, billions of trees are dying, the habitations of animals and birds are layed waste, rivers grow shallow and dry up, marvelous landscapes are disappearing forever.... Man is endowed with creativity in order to multiply that which has been given him; he has not created, but destroyed. There are fewer and fewer forests, rivers are drying up, wildlife has become extinct, the climate is ruined, and the earth is becoming ever poorer and uglier.”
—Anton Pavlovich Chekhov (1860–1904)