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Seems to be a much bigger difference in impact between one point five and two degrees than previously understood and that's the finding of the city is the scientific body so we're talking about impacts on earth systems that we as humans depend on take coral reefs so under one point five degrees of warming they would we would still have coral reefs they'd be reduced seventy to ninety percent but they would still exist now if you take the two degree scenario coral reefs would be all but wiped out about ninety nine percent would be gone this report has said so consider the impact of this on the p...

Many of the policies put forward to address the problem will lead to unacceptable levels of economic hardship. the fix can be very expensive in the short term for long-term gain." >> what you have to do is look at what that warming is. and when you look at the fact that we have gone from from 320 0.040, 400 parts per million, what you do is realize it's very slight. now, there is not consensus, and you can look at the latest ipcc report and look at dr. lindzen from m.i.t. his rejection of that. or judith curry who recently -- from georgia tech. there is not consensus there. i think what we hav...

Warming is. and when you look at the fact that we have gone from 320 parts per million, 0.032 to 0.040, 400 parts per million, what you do is realize it's very slight. now, there is not consensus, and you can look at the latest ipcc report and look at dr. lindzen from m.i.t. his rejection of that or judith curry who recently from georgia tech. there is not consensus there. i think what we have to do -- >> hold on. i just have to interrupt you. let me interrupt you because it's not -- you can pick out particular skeptics but you can't really say, can you, that the hundreds of scientists around ...

>> every single scientists including people who believe in global warming say there has been no increase in cyclones no interest in natural disasters. >> in higher water levels whether it is sandy or cyclones -- >> you are not listening to me. it's false to link this to emission of greenhouse gases. >> ridiculous. >> i gave you the fact from the ipcc report. you are picking and choosing thing. >> it increased and also this year's hurricane season was one of the mildest. >> 44,000 years. >> how do you explain that? >> do you have global rm with aing facts you pulled out of your butt? >> oh my g...

Of warming follow by calling that appear to have nothing to do with human activity. they say we need to more fully understand them to know what the future holds. anastasio is with the university of wisconsin. >> welch one of those regimes lasts about 30 years. and assuming we are already in this regime for 10 years, i would assume another 15 or so years of level of cooling. >> but the ipcc report is likely to dismiss this cause as nothing significant, just background noise. michael mann is a climatologist with penn state university. >> when we step back and look at the longer-term pattern wher...