Enterprise Rent-A-Car announced a new carbon-offset program covering the Enterprise, National Car Rental and Alamo Rent A Car brands

. Customers reserving cars through the company's call centers or Web sites can opt to pay $1.25 per rental, which "represents the cost of offsetting the CO2 impact of the average rental vehicle operating in the company's fleet," according to Enterprise. As part of the program--developed with carbon-offset provider TerraPass, launched in the United States and Canada, and planned for Europe--Enterprise pledged to match customer contributions, up to $1 million.