Global Science Report is a weekly feature from the Center for the Study of Science, where we highlight one or two important new items in the scientific literature or the popular media. For broader and more technical perspectives, consult our monthly “Current Wisdom.”
When the national media covers a weather story these days, it almost certainly will find some angle in which to insert/assert an element of human-caused climate change, and that element will always be characterized such as to have made the situation worse. It would take a lot of thinking on our part to try to recollect a major weather-related story in which the global warming was suggested to have ameliorated the impact—this despite a scientific literature that is complex and nebulous as to the direction of most impacts, and even less certain regarding the current detectability of such impacts.
Take for example the coverage of the current drought in California. As the drought drags on with spring snowpack in the Sierra Nevadas at record low levels—a finding which has prompted California Gov. Brown to enact statewide water restrictions—the press is eager to finger our greenhouse gas-spewing modern economy as the prime culprit. The problem is most scientific research suggests that the lack of precipitation in California has its roots in natural variability (for example, this recent paper by Thomas Delworth and colleagues which finds a common cause to drought in the western U.S. and the hiatus in global warming).
Thus, for the time being at least, bedeviled by actual science, most in the press have resisted placing much of the blame on the lack of precipitation at the feet of anthropogenic global warming.
But, there are actually two components which contribute to drought: 1) lack of precipitation, and 2) high temperatures.
Stymied on the first, many in the media have turned to the second.