A strong bout of natural cooling in 2008

Cooler North American temperatures in 2008 resulted from a strong natural effect, and the overall warming trend that has been observed since 1970 is likely to resume, according to this study. Using computer-generated models as well as observations, the team analyzed causes for climate variations in the recent decades. Special emphasis was given to the reasons for North American coolness in 2008. The research is an exercise in climate attribution, a scientific process for identifying the sources of observed climate and weather patterns.