As we approach certain extinction by our own hands, it is time to consider how to make the best out of our predicament. Although actions have been taken to address the urgency of climate change such as the 2015 Paris Agreement, we are still on track to witness severe climate catastrophe. By 2100, Phoenix, Arizona is on course to become uninhabitable due to extreme heat and dust storms. At the same time, Arizona offers enough solar energy potential to power the continental United States. Coupled with millions of climate refugees that will pass through Phoenix by centuries end, we must imagine what actions we can take to assure that those most vulnerable will be protected. For these reasons, PHOENIX2100 imagines the transformation of Phoenix by a 22nd-century apocalyptic climate.