Understanding Climate Risk

Science, policy and decision-making

Posts Tagged ‘David Karoly

Letter to SMH/The Age editors on McLean’s Op-ed

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Readers of the Australian press over the holiday period would have seen the spray from Maurice Newman the chairman of the Prime Minister’s Business Advisory Council in The Australian on December 31 where he claimed Australia’s climate policies were being driven by scientific delusion. That was followed by an article by David Karoly in The Age and Sydney Morning Herald on January 1 correcting Newman’s take on the science. Then on January 3, The Age and Sydney Morning Herald printed a response to Karoly and Newman from John McLean. Following is a letter I have sent to the editors of both papers.

Dear Sirs,

I am writing to express my great disappointment at The Age and Sydney Morning Herald’s decision to publish John McLean’s opinion piece Lack of accountability clouds the climate change debate on Friday January 3. After the recent statement by SMH letters editors Julie Lewis and Marc McEvoy that (October 13, 2013) “climate change deniers or skeptics are free to express opinions and political views on our page but not to misrepresent facts”, we in the scientific community were hopeful this would be the case. Alas, it is not.

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Uncertainty no excuse for procrastinating on climate change

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Guest post by Roger Bodman, Victoria University and David Karoly, University of Melbourne

Today we released research which reduces the range of uncertainty in future global warming. It does not alter the fact we will never be certain about how, exactly, the climate will change.

We always have to make decisions when there are uncertainties about the future: whether to take an umbrella when we go outside, how much to spend on insurance. International action on climate change is just one more decision that has to be made in an environment of uncertainty.

The most recent assessment of climate change made by the Intergovernmental Panel on Climate Change in 2007 looked at what is known with high confidence about climate change, as well as uncertainties. It included projections of future global warming to the end of this century based on simulations from a group of complex climate models.

These models included a range of uncertainties, coming from natural variability of the climate and the representation of important processes in the models. But the models did not consider uncertainty from interactions with the carbon cycle – the way carbon is absorbed and released by oceans, plant life and soil. In order to allow for these uncertainties, the likely range of temperature change was expanded.

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