Professor Grubb said that the new assessment was good news for small island states in the Pacific, such as the Marshall Islands and Tuvalu, which could be inundated by rising seas if the average temperature rose by more than 1.5C. “Pacific islands are less doomed than we thought,” he said.
Federal Scientist Peter Ward: 'Most scientists are convinced that greenhouse gases are the culprit, yet they have never shown by experiment that greenhouse gases absorbing infrared radiation from Earth can actually cause such warming. This is odd...How could carbon dioxide have become so important scientifically, economically, and politically without greenhouse-warming theory ever having been verified by experiment, a cornerstone of the scientific method?'
'I have now completed experiments showing that air with more than 23-times normal concentrations of carbon dioxide is heated no more than 0.2 degrees more than normal air when exposed to the same infrared radiation. Air with more than 10-times normal concentrations of carbon dioxide covered Earth 400 million years ago when ice ages were common.'
'If ozone depletion is the primary cause of global warming, the major increases in temperature by 2050 predicted by greenhouse-warming theory will not occur.'
Seth Borenstein: "There's a scientifically accepted method for determining if some wild weather event has the fingerprints of man-made climate change, and it involves intricate calculations. Those could take weeks or months to complete, and then even longer to be checked by other scientists. In general, though, climate scientists agree that future storms will dump much more rain than the same size storms did in the past."
Climate Depot Response: AP's Seth Borenstein claims there is some kind of arcane black box that finds fingerprint of man-made global warming! This coveted climate black box is only available to select few: Michael Mann, Michael Oppenheimer, Kerry Emanuel, Katharine Hayhoe, Kevin Trenberth, etc.
Dr. Jennifer Marohasy: "According to mainstream climate science, most of the recent global warming is our fault – caused by human emissions of carbon dioxide. The rational for this is a speculative theory about the absorption and emission of infrared radiation by carbon dioxide that dates back to 1896. It’s not disputed that carbon dioxide absorbs infrared radiation, what is uncertain is the sensitivity of the climate to increasing atmospheric concentrations. This sensitivity may have been grossly overestimated by Svante Arrhenius more than 120 years ago, with these overestimations persisting in the computer-simulation models that underpin modern climate science . We just don’t know; in part because the key experiments have never been undertaken ."
Climatologist Dr. Judith Curry: 'On balance, I don’t see any particular dangers from greenhouse warming. [Humans do] influence climate to some extent, what we do with land-use changes and what we put into the atmosphere. But I don’t think it’s a large enough impact to dominate over natural climate variability.'