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Supertopics:
Autumn (Fall)
Pollen Allergens

Ragweed (Ambrosia species, cause of autumn hay fever)

Subtopics and Documents:
Global Warming Increasing Ragweed Pollen
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
Ragweed Photos
ragweed photo 01
web2015-05-22
ragweed photo 02
web2015-05-22
ragweed photo 03
web
ragweed photo 04
web
ragweed flowers 01
web
giant ragweed photo 02
web
worst US cities and states for allergies and asthma
climate change increasing ragweed pollen and ozone pollution (pdf)
webJuan Declet-Barreto, Ph.D. and...NRDC2015-05-01
superweeds bringing Roundup-Ready disillusionment
webTom MeersmanMinneapolis Star Tribune2014-08-02
chamomile can intesify ragweed allergy
webJane E. BrodyNew York Times1995-09-06