Zena, Dubai is at sea level, and Phoenix Arizona is 1,086 ft (331 m) higher, which means it has a less normal dense atmosphere. The denser the atmosphere, the more light is reflected back into space. In Phoenix morning and afternoon light can be more easily 'refracted', or concentrated by the sun's rays. This is less a problem at sea level where the atmosphere is denser. You can accomplish the same thing by using an automobile's glass, or a magnifying glass.

Yeah, I'm slightly surprised too. Many plastics can withstand temperatures of 100C. (212F for those who just can't)

I just got photos from Dubai (my friend has to work there for couple of months). In every pic something else is melting. :) Maybe you just used to it? I don't know. :/

Stuff doesn't actually melt in Phoenix. These were all jokes that everyone in Phoenix knew were jokes (like a melting cactus??? They wouldn't melt!) but Bored Panda apparently thought were real. I lived there for two years. It takes HOURS to bake cookies in your car window, and you can't go out without shoes or your feet burn. But plastic doesn't melt.

In Dubai it REGULARLY gets that hot, so you don't build stuff out of things that will melt. Phoenix typically maxes out at high 90'sF (36-ish C) so they've been less careful about what they build stuff out of.