- "Global Warming Tipping Point Close?"--headline, ClimateArk.com, Jan. 27, 2004
- "Warming Hits 'Tipping Point' "--headline, Guardian, Aug. 11, 2005
- "Earth at the Tipping Point: Global Warming Heats Up"--headline, Time, March 26, 2006
- "Global Warming 'Tipping Points' Reached, Scientist Says"--headline,NationalGeographic.com, Dec. 14, 2007
- "Twenty Years Later: Tipping Points Near on Global Warming"--headline, Puffington Host, June 23, 2008
- "Global Warming: Those Tipping Points Are Closer Than You Think"--headline, WSJ.com, April 29, 2009
- "Have We Reached the Tipping Point for Planet Earth?"--video title, StudioTalk.tv, May 11, 2010
- "Must-Read Hansen and Sato Paper: We Are at a Climate Tipping Point That, Once Crossed, Enables Multi-Meter Sea Level Rise This Century"--headline, ThinkProgress.org, Jan. 20, 2011
- "Earth: Have We Reached an Environmental Tipping Point?"--headline, BBC website, June 15, 2012
- "In spite of the continued released [sic] of 90 million tons of global warming pollution every day into the atmosphere, as if it's an open sewer, we are now seeing the approach of a global political tipping point."--Al Gore, interview with Washington Post, Aug. 21, 2013
As far as I know, the earliest reference to global warming "tipping points" was in 1989. I did Google and Bing searches yesterday evening and there are more than one hundred alleged tipping points over the last 20 years.
Take, for example, the December, 2007, tipping point reference from National Geographic. Here are world temperatures (the same ones used by Al Gore's friends at the IPCC) since 2000:
Plus, there is no upward temperature trend (actually, it is downward) since we passed 400 ppm in CO2 concentration in the atmosphere. It, too, was supposed to produce an acceleration in the rate of warming.
This is ridiculous.
By any definition of the scientific method of advancing a hypothesis (i.e., a given tipping point exists) and measuring the results (lack of the predicted acceleration of warming) the tipping point hypothesis is falsified.
Global warming, more and more, has become a matter of 'faith,' not science.
"I may frequently be wrong, but am never in doubt."
-- Sir George Jessel