1. Anthropogenic climate change and allergen exposure: The role of plant biology 
Lewis H. Ziska, PhD, Paul J. Beggs, PhD 
Journal of Allergy and Clinical Immunology 
Volume 129, Issue 1, Pages (January 2012)
DOI: /j.jaci
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2. Fig 1
Change in length (in days) of the ragweed pollen season since 1995 as a function of latitude for National Allergy Bureau and Aerobiology Research Laboratories sites in the central United States and Canada, respectively. The line represents least-squares first-order regression plus confidence interval.
Data are from Ziska et al.40
Journal of Allergy and Clinical Immunology  , 27-32DOI: ( /j.jaci )
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