Lisa Jackson, administrator of the Environmental Protection Agency, said she may request that Congress maintain some greenhouse-gas regulations under the Clean Air Act even if a climate measure gets approval. This comes after some lawmakers recommended pre-empting EPA's authority so the bill may obtain the votes it needs to be passed in the Senate. The carbon-capping system under proposed climate legislation is not "economywide," she added, and there are emission sources that could be addressed via Clean Air Act policies.

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