U.S. EPA said today that it will reconsider a Bush-administration memorandum describing why the government should not regulate carbon dioxide emissions from new coal-fired power plants. In a letter to the Sierra Club, EPA Administrator Lisa Jackson said the agency would grant the advocacy group's petition seeking reconsideration of former Administrator Stephen Johnson's memo.

Arizona Gov. Jan Brewer (R) said she may rescind the state's new "clean-car" regulations that were championed last year by then-Gov. Janet Napolitano (D).

Federal wildlife officials today agreed to consider the American pika -- a rabbit-like mammal whose mountain habitat is changing thanks to global warming -- for protection under the Endangered Species Act, according to an environmental group that sued to initiate a review.

Partisan battle lines emerged in the House Energy and Environment Subcommittee today as the new panel held the first in a series of hearings on sweeping energy and climate legislation slated for markup before Memorial Day.

Offering an opening line of attack in this year's House global warming debate, top Republican leaders called yesterday for Judiciary Committee hearings into whether cap-and-trade legislation must originate in the House because it would raise government revenue like a tax.

Top House and Senate Democrats are headed in different directions on whether to combine a renewable energy standard with a much bigger global warming bill that establishes a cap-and-trade program setting first-ever limits on U.S. greenhouse gas emissions.

Maryland Gov. Martin O'Malley (D) yesterday said Maryland could shape the nation's environmental policy by passing its own legislation to curb greenhouse gas emissions.