13 Aug 2012:
Auto-Related Pollution in L.A.
Declined 98 Percent Over 50 Years
Levels of some automobile-related pollutants in Los Angeles have plummeted by 98 percent since the 1960s
, even as gasoline consumption nearly tripled during the same period, a new study says. Levels of
California Takes the Lead
With New Green Initiatives
California is taking bold steps to tackle climate change — from committing to reductions in emissions, to establishing a cap-and-trade system, to mandating more zero-emission vehicles. The bottom line, Mark Hertsgaard
reports, is to foster an economy where sustainability is profitable.
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volatile organic compounds (VOCs), which are emitted from the tailpipes of cars and are a key ingredient in ground-level smog, have dropped steadily and fell by about half between 2002 and 2010, researchers found. “The reason is simple: Cars are getting cleaner,” said Carsten Warneke, a researcher at the University of Colorado, Boulder, and lead author of the study, published in the Journal of Geophysical Research
. Using data from the National Oceanic and Atmospheric Administration (NOAA) and California air quality measurements, the scientists calculated that VOC levels declined by an average of 7.5 percent per year. Researchers attributed the steep decline in VOCs to the required use of catalytic converters, introduction of fuels less prone to evaporate, and improved engine efficiency. Warneke predicted that the decrease in VOC levels in Los Angeles will likely continue as engines become more efficient and older vehicles come off the roads.
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Yale Environment 360
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Tribal people and ranchers join together to stop a project that would haul coal across their Montana land. Watch the video.
is now available for mobile devices at e360.yale.edu/mobile
An aerial view of why Europe’s per capita carbon emissions are less than 50 percent of those in the U.S. View the photos.
Ugandan scientists monitor the impact of climate change on one of Africa’s most diverse forests and its extraordinary wildlife. Learn more.
video series looks at the staggering amount of food wasted in the U.S. – a problem with major human and environmental costs. Watch the video.
video goes onto the front lines with Colorado firefighters confronting deadly blazes fueled by a hotter, drier climate. Watch the video.
A three-part series Tainted Harvest
looks at the soil pollution crisis in China, the threat it poses to the food supply, and the complexity of any cleanup. Read the series.