WASHINGTON (AP) -- A look at where President Barack Obama and Republican presidential candidate Mitt Romney stand on energy and environmental issues: OBAMA: Ordered temporary moratorium on deep-water drilling after the massive BP oil spill in the Gulf of Mexico but has pushed for more oil and gas drilling overall. Approved drilling plan in Arctic Ocean opposed by environmentalists. Now proposes that Congress give oil market regulators more power to control price manipulation by speculators and stiffer fines for doing so. Achieved historic increases in fuel economy standards for automobiles that will save money at the pump while raising the cost of new vehicles. Achieved first-ever regulations on heat-trapping gases blamed for global warming and on toxic mercury pollution from power plants. Spent heavily on green energy and has embraced nuclear power as a clean source. Failed to persuade a Democratic Congress to pass limits he promised on carbon emissions. Shelved plan to toughen health standards on lung-damaging smog. Rejected Keystone XL oil pipeline from Canada because of environmental concerns but supports fast-track approval of a segment of it. Proposes ending subsidies to oil industry but has failed to persuade Congress to do so. ROMNEY: Supports opening the Atlantic and Pacific outer continental shelves to drilling, as well as Western lands, the Arctic National Wildlife Refuge and offshore Alaska; and supports exploitation of shale oil deposits. Wants to reduce obstacles to coal, natural gas and nuclear energy development, and accelerate drilling permits in areas where exploration has already been approved for developers with good safety records. Says green power has yet to become viable and the causes of climate change are unknown. Proposes to remove carbon dioxide from list of pollutants controlled by Clean Air Act and amend clean water and air laws to ensure the cost of complying with regulations is balanced against environmental benefit. Says cap and trade would "rocket energy prices." Blames high gas prices on Obama's decisions to limit oil drilling in environmentally sensitive areas and on overzealous regulation.