Living With the Greenhouse Effect - NYTimes.com
So much for warmups. The summer of 2011 is indicative of the new climatological norms that are emerging as conditions neatly echo longstanding projections of the consequences of steadily raising the concentration of heat-trapping greenhouse gases.[Revkin, March 2008] Skeptics on Human Climate Impact Seize on Cold Spell - New York Times
The world has seen some extraordinary winter conditions in both hemispheres over the past year: snow in Johannesburg last June and in Baghdad in January, Arctic sea ice returning with a vengeance after a record retreat last summer, paralyzing blizzards in China, and a sharp drop in the globe’s average temperature.
It is no wonder that some scientists, opinion writers, political operatives and other people who challenge warnings about dangerous human-caused global warming have jumped on this as a teachable moment.
According to a host of climate experts, including some who question the extent and risks of global warming, it is mostly good old-fashioned weather, along with a cold kick from the tropical Pacific Ocean, which is in its La Niña phase for a few more months, a year after it was in the opposite warm El Niño pattern.
Many scientists also say that the cool spell in no way undermines the enormous body of evidence pointing to a warming world with disrupted weather patterns, less ice and rising seas should heat-trapping greenhouse gases from burning fossil fuels and forests continue to accumulate in the air.