Houston, LA named top CO2 polluters

By Timothy Gardner

NEW YORK (Reuters) - Counties in the main U.S. petrochemical and driving hubs top the country's output of the planet-warming gas carbon dioxide, emitting about three times more CO2 than the top county in New York does, researchers said on Thursday.

Harris County in Texas emitted more than 18.6 million tons of CO2 in 2002, the latest year for which data was available, according to Vulcan, a three-year project funded by NASA and the U.S. Department of Energy. The county is home to oil and natural gas plants and Houston, which has about 2 million people.

Los Angeles County, home to car-clogged highways and about 4 million people, emitted nearly 18.6 million tons, said researchers from Purdue University, Colorado State University and Lawrence Berkeley National Laboratory, who led the project.

Suffolk County, in the metropolitan area of New York and home to nearly 1.5 million, emitted about 6 million tons and ranked 19th.

Vulcan developers hope the data will be used by governments as a baseline to track progress of U.S. cities and states in reducing the pollution that most scientists say could lead to deadly storms, floods and droughts.

The Environmental Protection Agency also measures greenhouse data, but its inventories are so far more centered on emissions sources rather than regions.

"Vulcan is going to show how places are doing in climate plans," Kevin Gurney, a Purdue professor who led the project, said by telephone.

The Vulcan data, which researchers said would soon be updated, came during early days of the U.S. fight against climate change.