evidence: However, more recent analyses, dating back decades, have found that many of even the earliest models were remarkably accurate in their predictions of global temperature increases. Now, as computing power increases and more and more refinements are added to modeling inputs, modelers are more confident in defending their work. As a result, says Dana Nuccitelli, author of Climatology versus Pseudoscience: Exposing the Failed Predictions of Global Warming Skeptics, "there’s definitely been a shift away from outright climate science denial; because the predictions have turned out to be so accurate, it’s getting harder and harder to deny the science at this point." [...] "We’ve understood for decades the basic science that if you introduce a certain amount of carbon dioxide into the atmosphere we would get a certain amount of warming," he says. "These predictions in the 1970s were remarkably accurate, but they were also using quite simplified climate models, in part because of our level of understanding of climate systems but also because of computation limitations at the time. It’s certainly true that climate models have come a long way."