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But the degree of commitment the Obama administration is prepared to make at Copenhagen has worried some congressional Democrats as well.

On Thursday, nine Democratic senators wrote to the president that, while they remain committed to tackling climate change, they want assurances that any agreement reached at the conference “is environmentally sound, affordable and fair,” and includes “significant commitments and actions by all major emitting countries.”

“Poorly designed climate policies could jeopardize U.S. national interests by imposing burdens on U.S. consumers, companies and workers without solving the climate challenge,” the Democrats cautioned.

c This story is based in part on wire service reports.