WASHINGTON – Some of the country's largest emitters of heat-trapping gases, including businesses that publicly support efforts to curb global warming, don't want the public knowing exactly how much they pollute.

Oil producers and refiners, along with manufacturers of steel, aluminum and even home appliances, are fighting a proposal by the Environmental Protection Agency that would make the amount of greenhouse gas emissions that companies release — and the underlying data businesses use to calculate the amounts — available online.

While gross estimates exist for such emissions from transportation and electricity production and manufacturing as a whole, the EPA is requiring companies for the first time to submit information for each individual facility.