Image: Pedestrians cross street
Pablo Martinez Monsivais  /  AP
One numbers-crunching scientist calculates that if all Americans between 10 and 74 walked just half an hour a day instead of driving, they would cut the annual U.S. emissions of carbon dioxide by 64 million tons. Americans would also drop about 3 billion pounds.
updated 11/11/2007 2:59:29 PM ET 2007-11-11T19:59:29

America's obesity epidemic and global warming might not seem to have much in common. But public health experts suggest people can attack them both by cutting calories and carbon dioxide at the same time.

How? They advise that people get out of their cars and walk or bike half an hour a day instead of driving. And also they suggest eating less red meat. That's how Americans can simultaneously save the planet and their health, say doctors and climate scientists.

The payoffs are huge, although unlikely to happen. One numbers-crunching scientist calculates that if all Americans between 10 and 74 walked just half an hour a day instead of driving, they would cut the annual U.S. emissions of carbon dioxide, the chief greenhouse gas, by 64 million tons.

About 6.5 billion gallons of gasoline would be saved. And Americans would also shed more than 3 billion pounds overall, according to these calculations.

The U.S. Centers for Disease Control and Prevention is considering public promotion of the "co-benefits" of fighting global warming and obesity-related illnesses through everyday exercise, like walking to school or work, said Dr. Howard Frumkin, director of the CDC's National Center for Environmental Health.

"A simple intervention like walking to school is a climate change intervention, an obesity intervention, a diabetes intervention, a safety intervention," Frumkin told The Associated Press. "That's the sweet spot."

Two birds with one stone
Climate change is a deadly and worsening public health issue, said Frumkin and other experts. The World Health Organization estimated that 160,000 people died in 2000 from malaria, diarrhea, malnutrition and drownings from floods — problems that public health and climate scientists contend were worsened by global warming. Officials predict that in the future those numbers will be higher.

The American Public Health Association, which will highlight the health problems of global warming in April, is seeking to connect obesity and climate change solutions, said executive director Dr. Georges Benjamin.

"This may present the greatest public health opportunity that we've had in a century," said University of Wisconsin health sciences professor Dr. Jonathan Patz, president of the International Association for Ecology and Health.

The key is getting people out of the car, Patz and Frumkin told the public health association at its annual convention. Reducing car travel in favor of biking or walking would not only cut obesity and greenhouse gases, they said, it would also mean less smog, fewer deaths from car crashes, less osteoporosis, and even less depression since exercise helps beat the blues.

In a little-noticed scientific paper in 2005, Paul Higgins, a scientist and policy fellow with the American Meteorological Society, calculated specific savings from adopting federal government recommendations for half an hour a day of exercise instead of driving.

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The average person walking half an hour a day would lose about 13 pounds a year. And if everyone did that instead of driving the same distance, the nation would burn a total of 10.5 trillion calories, according to the scientist, formerly with the University of California at Berkeley. At the same time, that would cut carbon dioxide emissions by about the same amount New Mexico produces, he said.

"The real bang for the buck in reducing greenhouse gas emissions was from the avoided health expenses of a sedentary lifestyle," said Higgins. Interactive: Vital Signs of a Warming World

Curb your taste for meat
But it is not just getting out of the car that's needed, said Dr. Robert Lawrence of the Johns Hopkins School of Public Health. A diet shift away from heavy meat consumption would also go far, he said, because it takes much more energy and land to produce meat than fruits, vegetables and grains.

Recent studies support that argument. Last year the United Nations Food and Agriculture Organization reported that the meat sector of the global economy is responsible for 18 percent of the world's greenhouse gas emissions. Much of that is indirect, including the fertilizer needed to grow massive amounts of feed for livestock, energy use in the whole growing process, methane released from fertilizer and animal manure, and transportation of the cattle and meat products.

Similar calculations were made in a study in September in the medical journal Lancet.

The average American man eats 1.6 times as much meat as the government recommends, Lawrence said. Some studies have shown eating a lot of red meat is linked to a higher risk for colon cancer.

As for fighting obesity and global warming by walking and cycling, do not expect people to do it easily, said Kristie Ebi. She is a Virginia public health consultant and one of the lead authors of the Intergovernmental Panel on Climate Change report.

Citing the decades-long effort to curb smoking, she said, "It turns out changing people's habits is very hard."

Copyright 2007 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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