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7 walnuts a day deliver health benefits
BELTSVILLE, Md., Feb. 26 (UPI) -- In some parts of North America, ragweed season now lingers almost a month longer than it did in 1995, U.S. researchers say.
The study, published in the Proceedings of the National Academy of Sciences, found the longer lasting and later ending ragweed season correlates to seasonal warming shifts linked to climate change dynamics in the higher latitudes.
Lewis Ziska, a plant physiologist with the Agricultural Research Service -- the scientific research agency of the U.S. Department of Agriculture -- led a team that identified 10 locations that had at least 15 years of data, from 1995 to 2009, on local ragweed pollen counts.
These locations were along a north-south transect from Austin, Texas, to Saskatoon, Canada.
The researchers found from 1995 to 2009, the number of frost-free days at higher-latitude study sites had increased and so had the length of the ragweed pollen season.
During that period, the pollen season lasted from 13 to 27 days longer than in 1995. The researchers also found that a longer ragweed pollen season was strongly correlated with a delay in the onset of the first fall frost.
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