Senate Democrats will unveil legislation to cut greenhouse gas emissions next Wednesday, kicking off what is likely to be a battle in Congress as lawmakers tussle over the economic impact of controlling global warming.

The bill has not been released formally but will be coauthored by Massachusetts Senator John Kerry and California Senator Barbara Boxer, a Congressional source said on Thursday.

“The overall architecture of the Senate bill is going to be very similar to the House version of the bill,” a separate source at an environmental group said via telephone from the G20 summit in Pittsburgh.

The proposal will add to an already full plate for lawmakers in Congress who are still working to hammer out details on healthcare and financial reforms.

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