Academic journal article Harvard International Review

Inclusive Science

Academic journal article Harvard International Review

Inclusive Science

Article excerpt

Because their specialized knowledge confers authority, climate scientists should make every effort to be accurate and complete when communicating to the public about the politically divisive issue of climate change. Unfortunately, there are several points where Alexander Bedritsky's thought-provoking article "Meteorology and the War on Climate Change" (Summer 2008) fails to do this.

Bedritsky states that "human activities are altering the climate at an increasingly alarming rate." However, according to data from the United Nations Intergovernmental Panel on Climate Change (IPCC), the rate of planetary warming that was established in the mid-1970s has been remarkably constant, varying only slightly from 0.17[degrees]C per decade.

The 21 computer models used by the IPCC share a common ensemble characteristic: for the midrange emissions scenario they, too, predict a constant rate of warming, not an "increasing" rate. The models simply produce different rates. As a meteorologist, Bedritsky knows that the way to adjudicate between differing forecast models is to literally "look out the window" to see which is performing the best. In the case of climate models, looking at the warming trend that has been established accomplishes the same, and yields a 21st century warming of 1.7[degrees]C, which is within, but near the low end, of the entire range of projections made by the IPCC.

Even this may be an overestimation. It is very clear, from both the IPCC data and from satellite measurements, that there has been no net warming since 1998 (which was a record year because of a very strong E1 Nino warming in the tropical Pacific). Further, as noted by Keenlyside et al. in Nature earlier this year, Atlantic and Pacific temperature patterns indicate that little warming can be expected for several more years. Many of the IPCC's climate models are indeed capable of reproducing El Nino-like temperature excursions, but none--not one--of the models illustrated in the IPCC's 2007 report projects a period of 15 years with no net warming. …

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