The world is cooling. No, wait! It's warming. Hold on! It's cooling! Er, sorry. We mean it's warming.

People who don't study the past are doomed to repeat it. Here's an excellent example:

Time, Sept. 10, 1923: "The discoveries of changes in the sun's heat and the southward advance of glaciers in recent years have given rise to conjecture of the possible advent of a new ice age."

NYT, Sept. 18, 1924: "MacMillan Reports Signs of New Ice Age."

NYT, March 27, 1933: "America in Longest Warm Spell Since 1776; Temperature Line Records a 25-Year Rise."

Time, Jan. 2, 1939: "Gaffers who claim that winters were harder when they were boys are quite right ... weather men have no doubt that the world at least for the time being is growing warmer."

Time, June 24, 1974: "Climatological Cassandras are becoming increasingly apprehensive, for the weather aberrations they are studying may be the harbinger of another ice age."

NYT, May 21, 1975: "Scientists Ponder Why World's Climate is Changing; A Major Cooling Widely Considered to Be Inevitable."

Time, April 9, 2001: "(S)cientists no longer doubt that global warming is happening, and almost nobody questions the fact that humans are at least partly responsible."

NYT, Dec. 27, 2005: "Past Hot Times Hold Few Reasons to Relax About New Warming."

Those who defend the current "global warming" garbage dismiss these past accounts as "wrong" because "we have better understanding, methods, equipment and data now." That equipment must include a time machine since they absolutely know they're right this time and things won't change in the future.