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Truck and engine manufacturer Navistar Inc. has accused the Environmental Protection Agency of attempting to remove documents from official records and allowing the Engine Manufacturers Association to write the draft of its selective catalytic reduction guidance document for 2010 “in secret collaboration with certain engine makers.”

The Senate last week kicked off debate on an energy bill that includes a controversial cap-and-trade provision to limit carbon emissions, summoning four top Obama administration officials to testify before the committee that will craft the Senate version of climate change and energy policy legislation.

Parcel carriers UPS Inc. and FedEx Corp. are broadening their accounting of greenhouse gas emissions, targeting sources beyond their own direct emissions.

Grocery retailer Safeway Inc. said it will begin inflating its truck and trailer fleet tires with nitrogen instead of compressed air.

In a vote divided largely along party lines, the House last week narrowly passed an energy bill that calls for the United States to reduce its greenhouse-gas emissions by 17% from 2005 levels by 2020 and includes a controversial cap-and-trade provision. The vote sends the measure to the Senate, where it likely faces a tough and long battle.