here's a somewhat controversial statement these days - if the earth's warming, it's a paltry trend.....0.31 degrees fahrenheit per decade since the mid-1970s. and even that 0.31 degree figure is suspect. for years, records from surface thermometers showed a global warming trend beginning in the late 1970s. but temperatures sensed by satellites and weather balloons displayed no concurrent warming.
these records have been revised a number of times. they are the surface record from the United Nations' Intergovernmental Panel on Climate Change (IPCC), the satellite-sensed temperatures originally published by University of Alabama's John Christy, and the weather-balloon records originally published by James Angell of the U.S. Commerce Department.
the two revisions of the ipcc surface record each successively lowered temperatures in the 1950s and the 1960s. the result? obviously more warming – FROM LARGELY THE SAME DATA.