Living on Earth has a nice report on the changes in weather and climate in Northern Arizona. The American West is feeling climate change more (so far) than the American East, and this report walks through many of the pieces of evidence suggesting how Arizona is changing.

A crucial part of the piece is how pinyon pines are dying off, and juniper trees are replacing them.
I appreciate this particular report because it compares what is happening now with what happened after the last ice age. When climate warmed in the past, trees moved from place to place, and certain botanists and archaeologists can track where, in the Grand Canyon area, trees were alive at various points.

The report warns us, as well, about the future water battles in the American West. Fresh water is an extremely finite resource there, and with increased temperatures and continued growth in Phoenix and Tuscon, it can only get more difficult.