Climate change is any major change that has been occurring for at least 10 years in the temperature, precipitation, wind, and other weather patterns that we measure. Across the planet in general, temperatures are rising and rainfall is increasing, but changes are not occurring everywhere. In some places temperatures may stay the same or drop, while other places may have far less rainfall. As a result of the changing climate, serious weather events such as heat waves, droughts, floods, and tropical cyclones happen more often. Some types of air pollution may also increase. These changes have the potential to affect human health in several direct and indirect ways, some of them severe.
Our changing climate may affect some of the things we need to be healthy such as clean air and water, enough food, and a place to live.
Changes in climate also can affect infectious diseases. For example, climate change may result in changing distribution of vector-borne and zoonotic diseases prevalent in the U.S. This could cause diseases such as dengue fever, Lyme disease, or West Nile virus to re-emerge, or spread to areas previously unaffected. Also, changes in climate can help the introduction and spread of new diseases, such as Chikungunya fever. In addition, climate directly affects the number of cases of waterborne through effects on water temperature and precipitation frequency and intensity.
While climate change is recognized as a global issue, the effects of climate change will vary across geographic regions and populations.
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