ScienceDaily (Oct. 24, 2012) ? Putting a speed limit on cargo ships as they sail near ports and coastlines could cut their emission of air pollutants by up to 70 percent, reducing the impact of marine shipping on Earth's climate and human health, scientists have found. Their evaluation of the impact of vessel speed reduction policies, such as those proposed by the California Air Resources board, appears in ACS' journal Environmental Science & Technology.
David R. Cocker III and colleagues explain that marine shipping is the most efficient form of transporting goods, with more than 100,000 ships carrying 90 percent of the world's cargo. However, engines on these vessels burn low-grade oil that produce large amounts of air pollution. Because fuel consumption and smokestack emissions increase exponentially with speed, the authors explored how speed limits could reduce pollution.
They found that slowing container ships to about 14 miles per hour (mph) reduced emissions of carbon dioxide by about 60 percent and nitrogen oxides by 55 percent compared to emissions at traditional cruising speeds of 25-29 mph. Soot emissions fell by almost 70 percent. The authors suggest that imposing these speed limits on vessels near ports and coastlines could significantly reduce their pollution and protect the health of people living in those areas.
The authors acknowledge funding from the California Air Resources Board and the U.S. Environmental Protection Agency.
Share this story on Facebook, Twitter, and Google:
Other social bookmarking and sharing tools:
Story Source:
The above story is reprinted from materials provided by American Chemical Society.
Note: Materials may be edited for content and length. For further information, please contact the source cited above.
Journal Reference:
- Mohammad Yusuf Khan, Harshit Agrawal, Sindhuja Ranganathan, William A Welch, J. Wayne Miller, David Cocker. Greenhouse Gas and Criteria Emission Benefits through Reduction of Vessel Speed at Sea. Environmental Science & Technology, 2012; : 120913133722005 DOI: 10.1021/es302371f
Note: If no author is given, the source is cited instead.
Disclaimer: Views expressed in this article do not necessarily reflect those of ScienceDaily or its staff.
bowling green marysville tornados dr. seuss dr seuss the temptations rush limbaugh sandra fluke
কোন মন্তব্য নেই:
একটি মন্তব্য পোস্ট করুন