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Supertopics:
Global Warming Increasing Allergens
Ragweed (Ambrosia species, cause of autumn hay fever)

Global Warming Increasing Ragweed Pollen

Documents:
hay fever from ragweed to increase with global warming
webRichard GrayDaily Mail2015-05-25
climate change is increasing ragweed pollen
webAlan BavleyKansas City Star2015-02-22