Dive Summary:

• Booming Arizona has a growing problem as its expanding urban footprint soaks up heat. The change interferes with the process of getting water back into the atmosphere so it can fall as rain, and scientists think the projected amount of urban growth could erode rainfall by 12%.
• One seemingly brilliant idea has been to paint roofs white so they won't soak up the sun's energy the way dark surfaces do.
• Now, researchers at Arizona State University have reported that reflecting the energy back up has drawbacks of its own and might cut rainfall by 4%.

From the article:

You don't really need to know much about the urban heat island effect to understand that Arizona is feeling it. ...