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Allergies will worsen and trigger more asthma attacks if climate changes continues, warns a new report by the National Wildlife Federation.

This excerpt is from an article appearing in USA Today

With spring arriving 10 to 14 days earlier than 20 years ago, pollination is starting sooner, according to the report, which shows projected changes in habitat. Tree pollen is the most common trigger for spring hay fever.

"Climate change could allow highly allergenic trees like oaks and hickories to start replacing pines, spruces and firs that generally don't cause allergies, exposing many more people to springtime allergy triggers," says lead author Amanda Staudt, a National Wildlife Federation climate scientist, in a statement.

The report identifies nine states as hot spots for large increases in allergenic tree pollen if global warming goes unabated: Arkansas, Iowa, Maine, Minnesota, New Hampshire, New York, Pennsylvania, Vermont and West Virginia.

It says seven more states are at risk for moderate increases in such pollen: Connecticut, Illinois, Kentucky, Massachusetts, Mississippi, Tennessee and Wisconsin.

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