In one study, accelerating spring's arrival by 30 days prompted a 54 percent increase in ragweedpollen production.
在一个研究中表明，春天加速30天到来提高了花粉54%的产量。
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Conclusion Significant difference exists between the extract of artemisia pollen and ragweedpollen, with the former being more complicated.
结论艾蒿花粉与豚草花粉提取液蛋白组分差异较大，前者更复杂；
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The findings correlate with analysis last year by the National Wildlife Federation that found ragweed growth rates and pollen counts increased with global warming.