X1021565301-00033-07634</DOCNO> 08/16/00 -- Global Warming's High Carbon Dioxide Levels May Double Ragweed Pollen Global Warming's High Carbon Dioxide Levels May Double Ragweed Pollen 2000 AgWeb.com August 16, 2000 by Tonya Ratliff The U.S. Department of Agriculture released research results on Tuesday indicating higher carbon dioxide (CO2) levels associated with global warming may have doubled the amount of pollen that ragweed produces -- mostly over the past four or five decades.
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Tonya Ratliff the amount of pollen Global Warming's High Carbon Dioxide Levels May Double Ragweed Pollen Global Warming's higher carbon dioxide (CO2) levels Global Warming's High Carbon Dioxide Levels May Double Ragweed Pollen Global Warming's pollen Ragweed Pollen Global Warming Ragweed Pollen Ragweed Pollen Global Warming
released produces indicating associated may have doubled ragweed [is] May Double [of] [is] May Double [of] [is] High Carbon Dioxide Levels May Double [of]
research results T:on Tuesday T:X1021565301-00033-07634</DOCNO> 08/16/00
higher carbon dioxide (CO2) levels
with global warming
the amount of pollen that ragweed produces T:mostly over the past four or five decades
the amount of pollen that ragweed produces
High Carbon Dioxide Levels
High Carbon Dioxide Levels
Warming