22 Jul 2011:
Is Slowing Global Warming, Study Says
Sulfur dioxide being spewed into the stratosphere by coal-fired power plants and volcanic eruptions has blunted the impact of global warming
over the past decade, offsetting roughly one third of the increased heat caused by greenhouse gas emissions, according to a new study. Researchers at the U.S. National Oceanic and Atmospheric Administration (NOAA) found that stratospheric aerosols formed by sulfur dioxide have nearly doubled in the past decade, and that those aerosols have been reflecting a significant amount of heat back into space. “Aerosols acted to keep warming from being as big as it would have been,” said NOAA atmospheric scientist John Daniel, a co-author of the study published online in Science
. Much of the sulfur dioxide that rose into the stratosphere six miles above the Earth came from coal-fired power plants, the study said. The aerosol finding, along with a weaker sun due to the most recent solar cycle, may help explain why global warming has not accelerated as rapidly in the past decade as it did in the 1990s. But scientists say that if major polluters such as China add better scrubbing technology to their power plants, then aerosols in the stratosphere are likely to decrease, which could accelerate warming.
Yale Environment 360 is
a publication of the
Yale School of Forestry
& Environmental Studies
Yale Environment 360
articles are now available in Spanish and Portuguese on Universia
, the online educational network. Visit the site.
Business & Innovation
Policy & Politics
Pollution & Health
Science & Technology
Antarctica and the Arctic
Central & South America
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.