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Volume 15, Issue 44 ~ November 1 - November 7, 2007

Got an Environmental Question? Send it to: EARTH TALK, c/o E/The Environmental Magazine, P.O. Box 5098, Westport, CT 06881. Or submit your question at: Or e-mail us at:

From the Editors of E/The Environmental Magazine

Allergic to Global Warming?

Rise in temperatures could mean trouble for your nose

Is it true that global warming can exacerbate allergies?

–Alex Tibbetts, Seattle, Wash.

Global warming can make allergies worse simply because the major pollen producers that trigger allergic reactions thrive and flourish in warmer air. Ragweed, one of the most common allergens in the U.S., grows faster and for longer periods as air temperatures rise due to climate change, according to a recent report from the nonprofit Natural Resources Defense Council called Sneezing and Wheezing: How Global Warming Could Increase Ragweed Allergies, Air Pollution and Asthma.

Ragweed also thrives on direct exposure to carbon dioxide, so as we emit more of this chief greenhouse gas from our tailpipes and smokestacks, we are unwittingly also causing more allergy-aggravating pollen to be produced. “There is a clear interplay,” says Kim Knowlton of Natural Resources Defense Council, between the onslaught of global warming and increasingly higher levels of ragweed pollen, especially in warmer urban areas already plagued with allergens.

“People living in some of the most populated regions of this country may be feeling the effects of global warming every allergy season,” Knowlton says. The Natural Resources Defense Council report concludes that an increasing number of the 110 million Americans who live in areas with existing ragweed problems will suffer the consequences of global warming as their noses begin to run and their eyes begin to water. Major metropolitan areas in the U.S. likely to be most affected include Atlanta, Philadelphia, Milwaukee, Los Angeles and Chicago, among other locales.

Public health statistics show that about 36 million Americans suffer from some form of seasonal allergy. While allergies can be annoying in their own right, they are also a main contributor to asthma and other serious respiratory problems, making them a serious health threat in their own right. Some 17 million Americans suffer from asthma, with well over half of them also sensitive to the allergens that can spark an asthma attack. Meanwhile, carbon dioxide emissions also contribute to smog, another trigger for asthma. Thus global warming represents a double whammy for asthmatics with pre-existing allergies.

“Global warming — through both its components and by-products — is creating a perfect storm of sneezing and wheezing for allergy and asthma sufferers in the U.S.,” says Gina Solomon, a senior scientist in the Council’s health program. She adds that her group’s recent analysis “shows us that people throughout the U.S. — in the North, South, East and West — will be very personally affected by global warming, and we need pollution controls throughout the country to help offset this problem.”

According to Natural Resources Defense Council, industrial and personal actions can help reduce increases in allergens and combat their effects. Federal, state and local governments can protect communities by reducing the sources of global-warming pollution and by creating better resources for citizens in need of information about pollen levels in their areas. Individuals can reduce their own exposure to ragweed and other allergens by checking news outlets for daily pollen counts before venturing outside for long periods.

For more information:

Natural Resources Defense Council, Sneezing and Wheezing:

Got an environmental question? Send it to: EarthTalk, c/o E/The Environmental Magazine, P.O. Box 5098, Westport, CT 06881; submit it at or e-mail Read past columns at:

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