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.'
The Sun as climate driver is repeatedly discussed in the literature but proofs are often weak. In order to elucidate the solar influence, we have used a large number of temperature proxies worldwide to construct a global temperature mean G7 over the last 2000 years. The Fourier spectrum of G7 shows the strongest components as ~1000-, ~460-, and ~190 - year periods whereas other cycles of the individual proxies are considerably weaker. The G7 temperature extrema coincide with the Roman, medieval, and present optima as well as the well-known minimum of AD 1450 during the Little Ice Age. We note that the temperature increase of the late 19th and 20th century is represented by the harmonic temperature representation, and thus is of pure multiperiodic nature. It can be expected that the periodicity of G7, lasting 2000 years so far, will persist also for the foreseeable future. It predicts a temperature drop from present to AD 2050, a slight rise from 2050 to 2130, and a further drop from AD 2130 to 2200. --Horst-Joachim Lüdecke and Carl-Otto Weiss, The Open Atmospheric Science Journal (11) 2017.
It may seem counterintuitive, but cleaner air could actually be exacerbating global warming trends. The soot and other particles that make up air pollution tend to scatter light back out into space. As countries around the globe have cleaned up their act, there are fewer particles to reflect light, meaning more sunlight is reaching the Earth’s surface and warming it, Martin Wild, a researcher at ETH Zurich in Switzerland, said Tuesday (Dec. 15) here at the annual meeting of the American Geophysical Union. Yahoo News, 29 Dec 2015