The warming and instability of the climate in the United States is well-established. In the past 25 years, Illinois has experienced the 1993 Mississippi River floods, the 1995 Chicago heat wave, the drought of 2012, the spring floods of 2013, and the arrival of West Nile Virus. Extreme weather events lead to health problems in our communities. Changes in climate also leads to changes in patterns of diseases that are spread by ticks and mosquitos. By preparing for climate change, the Illinois Department of Public Health hopes to protect the people of Illinois from heat stroke, asthma, waterborne illness, diseases spread by ticks and mosquitos, and other health problems worsened by climate change in Illinois.