The UN global warming religion promotion network IPCC is clearly getting desperate as it is trying to deal with its continuing loss of credibility. The warmist high priests seem to think that they will regain the initiative by making their doomsday prophesies even more megalomaniac:
New research, to be published in the journal Climatic Change in November, suggests humankind may have to remove carbon dioxide (CO2) from the atmosphere on a vast scale if emissions keep rising after 2020.
The series of articles provide scenarios which will form the basis of the next report by the U.N.'s Intergovernmental Panel on Climate Change (IPCC) in 2013 and 2014.
At present emissions levels, in less than 20 years the sky would effectively be full, meaning every extra tonne of carbon dioxide (CO2) emitted would have to be removed to stay within safer climate limits, one lead author says.
"If we want to stay below 2 degrees and possibly achieve 1.5 in the 22nd century then we're not going to get around these negative emissions," said one lead author, Malte Meinshausen, of Germany's Potsdam Institute for Climate Impact Research.
Meinshausen's study calculates that the world would have to halt rises in global greenhouse gas emissions within five years.
By 2070, humans should have a net output of minus 3.5 billion tonnes CO2 annually to reduce temperature rises further below 2 degrees in the long-term and so slow sea level rise.
Researchers say that allowing emissions to continue to rise after 2020 would involve passing 2 degrees as early as mid-century.
After that, the only way back would be CO2 removal from the atmosphere on a massive scale -- a net output of minus 18 billion tonnes of CO2 annually during the next century and for about 100 years, they calculated in the new series of studies.
That compares with actual emissions of 33 billion tonnes CO2 last year from burning fossil fuels. Emissions have risen 2-3 percent per year over the last several decades.
The view that extreme steps are needed is therefore becoming more accepted.
"If we really are going to avoid more than 2 degrees of warming, we're either looking at geo-engineering in the sense of sun shields in space, or negative emissions type of geo-engineering in the second half of this century," said Oxford University climate scientist Myles Allen.
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On thing is clear: The scaremongerers are going to be disappointed. Their new scare tactics will have one certain - positive - effect; the total and final loss of credibility of the IPCC.