Just in case there was any question about who the Environmental Protection Agency is going to bat for under Bush: A new series of whimsical public service announcements from the Environmental Protection Agency are lampooning the notion that cars can be made more energy efficient while the ads encourage conservation at home...A top E.P.A. official said the $1 million campaign was developed by a branch of the agency that specializes in energy-saving home appliances and was not intended to send a message about cars. In a 60-second version of the public service announcement, a woman named Suzanne says she is concerned about pollution and global warming, but laments the homegrown efforts of her husband, Mark, to cut emissions from the family car. Mark - nerdy, pudgy, harried - is shown rigging up their car, first with a sail, then a microwave contraption using huge satellite dishes, and finally a helium tank with a bulbous hose. "The E.P.A. says the energy we use in our home can cause twice the greenhouse gases of a car," Suzanne says, adding that she has started buying energy-saving household products. The ad ends with a shot of Mark pushing the car down a hill and Suzanne saying, "He still marches to the beat of a different drum." At one point, the car fills with helium, Mark starts talking like Mickey Mouse and two men in the backseat shake their heads and say "Genius!" Indeed, as the E.P.A. says, energy use at home can cause twice the emissions of a single car. But most families have more than one car and emit roughly the same amount of global warming gases in their vehicles as in their homes, said David Friedman, senior policy analyst at the Union of Concerned Scientists, an environmental research and advocacy group. "With a car, you can cut your fuel use in half by using a hybrid," he said. "You're not likely to cut your electricity use in half by using more efficient appliances."