| http://www.w3.org/ns/prov#value | - Science Daily: Increasing the ratio of black carbon to sulphate in the atmosphere increases climate warming, suggests a study conducted by a University of Iowa professor and his colleagues and published in the July 25 issue of the journal Nature Geoscience.Black carbons -- arising from such sources as diesel engine exhaust and cooking fires -- are widely considered a factor in global warming and a
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