A prominent researcher has publicly released a draft of a forthcoming paper with grim predictions for both short- and long-term warming, but not all climate scientists are happy with its conclusions. A team of scientists led by former NASA climate scientist James Hansen, who formally alerted U.S. government leaders to climate change in his 1988 congressional testimony, is working on a new study that warns of a possible short-term spike in global temperatures of 2 degrees Celsius above pre-industrial levels by 2050. In a climate change irony, the scientists said the sudden increase in warming — especially since 2010 — is largely due to a sharp decline in emissions of climate-cooling sulfate aerosol particles over the past 10 to 20 years, as new regulations have curbed emissions from the biggest sources. including the burning of coal and heavy marine fuels. (Bob Berwyn)

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