WASHINGTON, D.C. -- California Attorney General Jerry Brown will back up his legal action against the federal Environmental Protection Agency (EPA) with words.

Brown is scheduled to address the EPA in Arlington, Va. Tuesday morning on states' rights to regulate greenhouse gas (GHG) emissions from sources like vehicle tailpipes. His testimony will commence at 9:00 a.m. ET at the EPA Potomac Yard Center.

The attorney general's EPA gig kicks off a round of speaking engagements for him Tuesday on state regulation of GHGs, which California and 11 other states have already passed. EPA has not yet ruled on whether the states can enact such rules.

Frustrated, Brown and California Governor Arnold Schwarzenegger recently filed suit against the EPA over what they claim is foot-dragging on the issue, LegalNewsLine reported last month. The state has been requesting an EPA "waiver" to regulate GHGs since 2005.

The pair say a U.S. Supreme Court ruling in March gave the states the authority to regulate GHGs. The EPA, which opposes such authority, appears to be hedging over the issue of whether or not GHGs endanger public health.

Following his EPA address, Brown will hold a news conference on the issue at noon at the Arlington Hyatt Regency Crystal City. He'll then testify before the U.S. Senate Committee on Environment and Public Works at the Senate Office Building in Washington, D.C. at 2:30 p.m.

Brown is showing a fondness for grandstanding on vehicle emissions. Last week's LegalNewsLine reported that Brown has piggy-backed on a lawsuit filed by his predecessor, Bill Lockyer, against the National Highway Traffic Safety Administration over revised SUV-mileage figures.