The future offers tremendous environmental risk from urbanization, as well as incredible potential to bring nature's power to cities, and I'm sure of one thing: Whatever happens, China will be at the center.
It's been a rough couple of years for America.
This is one man's mission to document the city's smog.
But the country isn't in the clear yet.
Record-breakingly bad air is likely to worsen as China enters pollution "high season," one expert warns.