During the mid-part of the last decade, when the population growth rate was at its highest, the Phoenix area experienced rapid development and urban sprawl. The result has been an intensification of the Urban Heat Island effect. In this edition of Decades, author Sally Wittlinger discusses this uncomfortable consequence of urbanization.

In a desert city such as Phoenix, summertime heat is a way of life, but how much does the built environment contribute to the intensity of the heat on a summer night? In urbanized Phoenix, nights don’t cool down as much as in the surrounding rural areas and on more and more summer nights, the official Phoenix temperature fails to drop below 90 degrees. Climate plays a huge role in the comfort and quality of life of residents, with numerous implications for tourism, energy demand, water use, and the vulnerability of low-income families.

The report includes original articles by Arizona policy practitioners and observers, reprints of pertinent articles by experts beyond Arizona, and a list for further reading. Articles of varying lengths and complexities are purposefully included so as to offer something to readers with different levels of interest in and knowledge of the subject matter.

Despite several early attempts in the Arizona Legislature to modify the framework for where the newly-passed Proposition 200 money would go, the four accounts established in the original voter-approved Tobacco Tax and Health Care Act have been maintained as intended since 1995. However, large sums of Proposition 200 revenue – on average $90 million annually – have gone unallocated and unspent by the Legislature.