Warming springs can cause plants to bloom earlier, change the locations of migrating species, alter the awakening time of hibernating animals, and increase the seasonal insect populations. As a result, plants may bloom before their needed pollinators are available, and aggressive insects can cause damage to food crops. These effects have the potential to threaten agricultural yields, driving up food prices or even causing shortages.
The earlier warming can also make the allergy season worse. Pollen counts have already increased over the last century and are projected to nearly double by 2060. See our report from last spring for more information. Plus, warmer spring temperatures may increase the growth of certain types of mold, further worsening the season for allergy sufferers.