"$700-million-plus cleanup that could last decades"

A great retrospective from the Berkshire Eagle on the long term financial and environmental cost of severe river pollution:

Nine years into an estimated $700-million-plus cleanup that could last decades, the river is both adored and dreaded: Anglers catch fish that they dare not eat; boaters canoe and kayak in the water but never swim; and farmers raise crops and animals near it, just outside the polluted floodplain.

This is a part of the legacy of industrial western Mass. How are China's rivers doing? How much will they cost to clean? Can experience here become a business there?