Chemistry can facilitate access to unpolluted water sources -- a challenge that will affect future stability in many regions.

UNESCO: Message by UNESCO Director-General Irina Bokova

The tourists come for the unpolluted beaches or to soak up rural life at one of the small resorts that dot the coastline.

CNN: WHERE IT'S GOOD TO BE OLD

He described a region that contains much of Germany's heavy industry yet the rivers along which factories and mines are sited remained relatively unpolluted.

ECONOMIST: Allen Kneese

That's because the waters to the south and west are among the most unpolluted in the world--ideal for catching not only tuna but also oysters, mussels and lobsters.

FORBES: Magazine Article