A Dozen Global Warming Slogans May 22, 2011Posted by honestclimate in Discussions.
Tags: climate change, global warming, Professor Bob Carter
A Dozen Global Warming Slogans
By Professor Bob Carter
For many years now, our media outlets have been awash with commentary about dangerous human-caused global warming. The coverage tends to move in spasms relating to events such as meetings of the Intergovernmental Panel on Climate Change (IPCC) or, as at present, to government efforts to introduce penal legislation against carbon dioxide emissions in the vain belief that this will “stop global warming”.
Given that carbon dioxide is indeed a greenhouse gas (albeit a mild and diminishingly effective one at currently increasing levels of atmospheric concentration), and that some human-caused emissions accrue in the atmosphere, the question of dangerous warming was a good one to raise back in the late 1980s. Since then, with the formation of the IPCC, and a parallel huge expansion of research and consultancy money into climate studies, energy studies and climate policy, an intensive effort has been made to identify and measure the human signature in the global temperature record at a cost that probably exceeds $100 billion. And, as Kevin Rudd might put it, “You know what? No such signature has been able to be isolated and measured.”
That, of course, doesn’t mean that humans have no effect on global temperature, because we know that carbon dioxide is a mild greenhouse gas, and we can also measure the local temperature effects of human activity, which are both warming (from the urban heat island effect) and cooling (due to other land-use change, including irrigation). Sum these effects all over the world and obviously there must be a global signal; that we can’t identify and measure it indicates that the signal is so small that it is lost in the noise of natural climate variation.
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