WASHINGTON - Sen. Sherrod Brown warned yesterday that a global-warming measure would collapse unless it shielded U.S. manufacturers from imports from countries that do not curb their emissions of greenhouse gases.

In a letter to backers of a Senate climate-change bill, Brown and eight other Democrats called for tariffs against goods produced abroad, federal loan guarantees to help U.S. companies develop cleaner energy, and federal dollars to protect manufacturers "from spikes in energy prices."

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