Pollution

File:GUIDO When you need an umbrella.jpg

For starters, just a collection of links to modern instances of pollution in the real world. To be expanded.

Acid rain

Acid rain in Seoul

http://www.teachkoreanz.com/living/rain.htm

Toxic snow

Formaldehyde-laden saw dust in Arkansas

http://www.virginiaforestwatch.org/arkansas.htm