Aldo DeRubeis bought compact fluorescent bulbs on Monday at the Home Depot in New Rochelle, N.Y. Sales of compact fluorescents climbed to 75 million last year for the retailer. Recycling them is about to get easier. Home Depot, the nation's second-largest retailer, will announce on Tuesday that it will take back old compact fluorescents in all 1,973 of its stores in the United States, creating the nation's most widespread recycling program for the bulbs. "We kept hearing from the community that there was a little bit of concern about mercury in the C.F.L.'s,' said Ron Jarvis, Home Depot's senior vice president for environmental innovation, using the industry abbreviation for the bulbs. "And if the C.F.L.'s were in their house, how could they dispose of them?' Until now, consumers had to seek out local hazardous waste programs or smaller retail chains willing to collect the bulbs for recycling, like Ikea and True Value. Some consumers have waited for retailers like Wal-Mart to have a designated recycling day. Others bought kits to mail the bulbs to a recycling facility. The Environmental Protection Agency has been looking into putting bulb drop-off boxes at post offices, said Jim Berlow, director of the agency's hazardous waste minimization and management division. But those plans are not final, and across most of the country, recycling the bulbs has been inconvenient at best. Industry professionals estimate that the recycling rate is around 2 percent. Home Depot's program, which will accept any maker's bulbs, will bring relatively convenient recycling within reach of most households. Mr. Jarvis estimated that 75 percent of the nation's homes are within 10 miles of a Home Depot. "We're trying to do the right thing,' he said. "Some of the things that we do are for the community and not for the bottom line.' Both Home Depot and Wal-Mart, the nation's largest retailer, have vigorously promoted the bulbs as part of their commitment to the environment. Wal-Mart announced in October 2006 that it wanted to sell 100 million compact fluorescents by the end of 2007. It surpassed that goal, selling 193 million bulbs to date. Wal-Mart has accepted expired bulbs at take-back events in particular markets and is exploring how to do it consistently on a national level. Wal-Mart has more than twice the number of United States stores as Home Depot. The need for a national recycling program became apparent to Home Depot as sales of compact fluorescents, which had been slow compared with sales of incandescent bulb, climbed to 75 million last year, from about 50 million in 2006. And a recycling program is likely to drive even more people to Home Depot. "We haven't really had to develop the infrastructure' before now, said Steven Hamburg, interim director of the Center for Environmental Studies at Brown University. "The demand wasn't there.' But lately, consumers have been getting the message