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:
“The earth is not a mere fragment of dead history, stratum upon stratum like the leaves of a book, to be studied by geologists and antiquaries chiefly, but living poetry like the leaves of a tree, which precede flowers and fruit,—not a fossil earth, but a living earth; compared with whose great central life all animal and vegetable life is merely parasitic.”
—Henry David Thoreau (1817–1862)
“There were ghosts that returned to earth to hear his phrases,
As he sat there reading, aloud, the great blue tabulae.
They were those from the wilderness of stars that had expected more.
There were those that returned to hear him read from the poem of life,
Of the pans above the stove, the pots on the table, the tulips among them.
They were those that would have wept to step barefoot into reality....”
—Wallace Stevens (1879–1955)
“Time! Joyless emblem of the greed
Of millions, robber of the best
Which earth can give ...”
—Amy Lowell (1874–1925)