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.