When the effects are calculated in a standard climate model, the result is a reduction in average temperature of 0.00005oC (one twenty-thousandth of a degree Celsius, or one ten-thousandth of a degree Fahrenheit).

FORBES: Solving Climate Change: It's the Technology, Stupid

It's also worth chucking into the mix that the global average temperature variation between even the strongest El Nino event and the next ordinary year is a fraction of a degree Celsius - certainly less than the rise of about 0.6C that we've seen since the beginning of the study period, in 1950.

BBC: Warm, wet - and warring?

Facts: Global surface temperature rose about three-fourths of a degree Celsius in the 20th century.

FORBES: Global Warming And Global Food Security

Global mean temperature varied within a range of one degree Celsius during the Holocene.

WSJ: In Study, Past Decade Ranks Among Hottest

The direct warming due to doubling CO2 levels in the atmosphere can be calculated to cause a warming of about one degree Celsius.

WSJ: William Happer: Global Warming Models Are Wrong Again

Evidence of past explosions is revealed in the image - huge lobes of 20-million-degree Celsius gas (the red loops in the image at approximately the 2 o'clock and 7 o'clock positions) that extend over dozens of light-years on either side of the black hole.

BBC: Black hole 'on a diet'

The result, says Dickinson, is a uniformity of temperature across all the samples being tested to within 0.1 degree Celsius.

FORBES: Technology

The report said the blanket of heat-trapping gases has already raised ground temperatures by one-half degree Celsius (1.1 F) in the last 100 years, and scientists say the pace could quicken dramatically over the next 100 unless pollution is limited.

CNN: U.N. bids to rescue climate deal

"Six Degrees", by leading environmental campaigner Mark Lynas, sounds a red alert for the health of the planet, charting degree-by-degree the likely consequences of rising temperatures up to the worst-case scenario 5.8 degrees Celsius (10 degrees Fahrenheit) rise envisaged by the Intergovernmental Panel on Climate Change's 2001 report.

CNN: Six degrees of devastation