Phoenix will be inhabitable within 10 years due to extreme heat.
While extreme heat is a growing problem due to global warming the claim that Phoenix will become uninhabitable within 10 years is an exaggerated claim. According to National Climate Assessment Phoenix will face increasing temperatures due to climate change and heat waves leading to illness. However, phoenix is one of the fastest growing cities and efforts have been made to maintain this problem with urban planning. Even though extreme heat is a serious issue declaring a city uninhabitable in such a short time is not supported by real scientific evidence.
Source: U.S. Global Change Research Program. Fourth National Climate Assessment, Volume II: Impacts, Risks, and Adaptation in the United States, U.S. Government Printing Office, 2018.