Denying climate change is like saying the moon is made of cheese, President Obama has said, in his latest attempt to persuade an unconvinced world that global warming is the most urgent crisis of our time.
He was speaking to a crowd of around 30,000 at a commencement ceremony at the University of California, Irvine.
One of the problems for scientists interested in basing their conclusions on real-life observations is that NASA, the organisation which put man on the moon, is now being run by climate alarmists like Gavin Schmidt, who took over from James Hansen, a man with similar views, a short while back.
The idea that altering the concentration of a trace gas will result in global catastrophe is ludicrous. This is politics masquerading as science, and a lot of NASA members do not like it. However, if you wish to remain employed, it is difficult to go against the official pronouncements of those who employ you. You have to be out of the game or financially independent to make truthful comments about climate change in public.
The human contribution to atmospheric carbon dioxide since the start of the industrial revolution has been estimated at about 25%. So humans’ carbon dioxide greenhouse effect is a quarter of 0.013, or about 0.00325. Total warming of the Earth by the greenhouse effect is widely accepted as about 33 degrees Centigrade, raising average temperature to 59 degrees Fahrenheit. So the contribution of man-made carbon dioxide is less than 0.2 degrees Fahrenheit, or under 0.1 degree Centigrade.
However, in 2012, 49 former NASA astronauts and scientists were sufficiently angry to to protest against the propaganda being promoted by their former employer in the persons of Hansen and Schmidt, at the NASA Goddard Institute for Space Studies (GISS).
Those individuals wrote "We believe the claims ..... that man-made carbon dioxide is having a catastrophic impact on global climate change are not substantiated, especially when considering thousands of years of empirical data."
Obama said, in his address, "I do know the overwhelming majority of scientists who work on climate change, including some who once disputed the data, have put the debate to rest."
This is untrue, and is just a repetition of the "97 per cent consensus" slogan which was invented for promotion in the mass media.
The other thing to remember is that scientific knowledge is not a numbers game; the truth of an idea is not established by counting the number of people who agree with it.
There was certainly one factual sentence in Obama's address.
He said "I'm not a scientist."
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