The document provides evidence that the lengthening of the ragweed season in the central US is an important consequence of climate change. According to the document, rising temperatures due to climate change have extended the growing season for ragweed by as much as 27 days in some areas, which has led to an increase in the amount of pollen produced by the plant. The document also notes that ragweed pollen is a significant cause of allergic reactions and asthma, and that the longer growing season has resulted in a longer allergy season for people in the central US.
Furthermore, the document also states that climate models predict that temperatures will continue to rise in the central US, which could further extend the ragweed season and exacerbate the problem for allergy sufferers. This information provides a strong argument for the importance of the lengthening of the ragweed season in the central US as an important consequence of climate change. It highlights the impact of climate change on human health and suggests that the problem is likely to worsen in the future. Therefore, this document can be used to support the claim that the lengthening of the ragweed season in the central US is an important consequence of climate change.