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. 2017 Mar 1;125(3):A60. doi: 10.1289/ehp.125-A60

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graphic file with name ehp.125-A60.g001.jpg — CO₂ may be good for plant growth, but more growth also means more pollen. In a new study investigators estimated the percentage of the European population that will be susceptible to ragweed allergies in coming decades (the key in this figure indicates the estimated percentage of the population that is sensitized to ragweed pollen).

Source: Lake et al. (2017) ²