In 1984, Idso, along with A.J. Brazel, published a study in "Nature" which concluded, contrary to a report the National Academy of Sciences released the previous year, that rising CO2 levels would increase streamflow. The study's authors argued that the NAS report came to the opposite conclusion because it neglected the effect of rising CO2 levels on plants. In the 1997 book, "Global Warming: The Science and the Politics" Idso said: "I find no compelling reason to believe that the earth will necessarily experience any global warming as a consequence of the ongoing rise in the atmosphere's carbon dioxide concentration." In the 1998 paper, "CO2-induced global warming: a skeptic's view of potential climate change" Idso said: "Several of these cooling forces have individually been estimated to be of equivalent magnitude, but of opposite sign, to the typically predicted greenhouse effect of a doubling of the air’s CO2 content, which suggests to me that little net temperature change will ultimately result from the ongoing buildup of CO2 in Earth's atmosphere."