11.   Rampant development has severely damaged native salmon populations.

12.   Rivers supporting naturally reproducing salmon populations span portions of Russia, Europe, Iceland and eastern Canada.

13.   Salmon populations have nevertheless declined there.

14.   The diversion was a boon to farmers, but devastated the salmon population.

15.   The United States is rethinking its dam system in the Northwest, where it has ravaged the salmon population.

16.   Then, salmon populations began to plummet.

17.   Weld compared the situation in New England to that in the Pacific Northwest, where a natural disaster was declared last year in response to the shrinking salmon population.

18.   Wild salmon populations, because they spawn in separate watersheds from one another, are isolated and thus genetically distinct.

19.   You can even blame it on El Nino, which has increased ocean temperatures, threatening salmon populations.

20.   Alaskans argue that much of the salmon population problem is due to hydropower dams on the Columbia River system that provide Oregon and Washington with cheap electricity.