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Why does this plant make me think about buying a bicycle?


This is ragweed, one of the major sources of the pollen that drives my allergies crazy. Recent studies show that as carbon dioxide levels in the atmosphere increase, it is having an impact on many plants, including ragweed. Ragweed plants are producing more pollen and flowering over a longer period of time as those levels go up. Burning fossil fuels is a major contributor to the increase in carbon dioxide, and cars produce a lot of it.