Word: weediest
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Dates: during 2000-2009
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...pollen - which can be connected directly to rising levels of CO2. Researchers have shown repeatedly that elevated levels of CO2 stimulate weeds to produce pollen out of proportion with their growth rates - meaning you get more pollen per plant, which means more allergies. Even worse, it seems that the weediest species seem to thrive disproportionately in high CO2 environments. The wave of urbanization in America and much of the world doesn't help - the urban environment, often hotter and with more CO2 than rural areas, is ragweed heaven. "Urban places, because of the baking effect of that increased concrete, definitely...
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