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Posted Fri Feb 19 2010: from PNAS, via PhysOrg:
Cars Emerge as Key Atmospheric Warming Force: Study
For decades, climatologists have studied the gases and particles that have potential to alter Earth's climate. They have discovered and described certain airborne chemicals that can trap incoming sunlight and warm the climate, while others cool the planet by blocking the Sun's rays.... Rather than analyzing impacts by chemical species, scientists have analyzed the climate impacts by different economic sectors.... The on-road transportation sector releases significant amounts of carbon dioxide, black carbon, and ozone—all substances that cause warming. In contrast, the industrial sector releases many of the same gases, but it also tends to emit sulfates and other aerosols that cause cooling by reflecting light and altering clouds.... In their analysis, motor vehicles emerged as the greatest contributor to atmospheric warming now and in the near term. Cars, buses, and trucks release pollutants and greenhouse gases that promote warming, while emitting few aerosols that counteract it.
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'Doc Michael says:
Oh, sure. Next you'll be telling me that bovine flatulence is a problem.

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