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" ... But mitigation options are expensive. And it is not known if developing countries can afford them or will choose to implement them. Along our own Columbia River here in the Pacific Northwest, more than $7 billion has been spent since 1950 on efforts to save salmon speciesby stock enhancement, constructing fishways such as ladders or steps, screening irrigation diversions, rehabilitating habitat, and providing downstream passage. Even so, we still rely on hatchery production along the river to save these species from extinction. ... "