There is no question, for course, that the human addition of carbon dioxide is a major climate forcing, both with respect to its warming influence but also its biogeochemical effect. However, there are other equally or more important climate forcings in terms of altering climate patterns such as droughts, floods and extreme weather.And over at Pajamas Media, Charlie Martie also talks my father, in a wide-ranging and informative interview. The whole interview is worth a read, here is how it starts:
Both those who denounce “global warming” as a hoax and RealClimate’s claim that this is a “tempest in a teapot” are incorrect. With respect to the role of humans in the climate system, there is incontrovertible evidence that we exert both warming and cooling effects. The warming occurs through the emission of carbon dioxide and other greenhouse gases and certain aerosols, and cooling [occurs due to] other types of aerosols. Land use change due to human land management also effects warming and cooling forcings.
With respect to the RealClimate dismissal of the emails, however, there are serious issues exposed by the emails — including the goal of these scientists to prevent proper scientific disclosure of their data, as well as to control what papers appear in the peer reviewed literature and climate assessments. The IPCC assessment, with which major policy decisions are being made, involves the individuals in the emails who have senior leadership positions.