One disease of increasing concern is dengue fever. As temperatures get warmer, certain species will migrate to new areas and carry disease with them. “Looking at where mosquitoes are now in the U.S., they don’t live long enough for dengue to incubate,” explained Hayhoe, adding that climate change would extend the mosquito’s lifetime and allow the disease to develop in areas such as Chicago.
Temperatures in Illinois have been plummeting for 90 years, but actual data is never an impediment to Katherine’s ambitions.






