Rio Closes Its Massive Jardim Gramacho Dump One of the world's largest open-air landfills, a vast, seaside mountain of trash where thousands of people have made a living sorting through the debris by hand, will close this weekend after 34 years in malodorous service. Long a symbol of ill-conceived urban planning and environmental negligence, Rio de Janeiro's Jardim Gramacho dump is being transformed into a vast biogas facility that will harness the greenhouse gases generated by the rotting rubbish and turn them into fuel capable of heating homes and powering cars. Environmentalists had blamed Gramacho for the high levels of pollution in Rio's once pristine Guanabara Bay, where tons of run-off from the garbage had leaked. Less clear is what will happen to the more than 1,700 people who worked at the site, scaling hills of fresh, fly- and vulture-covered trash to pluck recyclable plastic, paper and metal from the 9,000 tons of detritus once dumped there daily. Known as "catadores" in Portuguese, the trash pickers will receive a lump-sum payout from the city, but there's no place for them at Gramacho's replacement, the high-tech Seropedica dump, where most of the Marvelous City's garbage is already being sent. "When you first get here, you're like, 'Ick, I don't know if I can do this,' but then you get used to it and you make friends and you find it's good work," said Lorival Francisco dos Santos, a 46-year-old from Brazil's impoverished northeast who spent 13 years at the landfill. In the works for years, Gramacho's closure was postponed several times, and was slated to finally take place just weeks before the United Nations' Rio+20 megaconference on sustainable development here. It also comes as the city gears up to host the 2014 World Cup soccer tournament and the 2016 Olympics. "We've been telling the catadores about it for years, but somehow they never believed it would really happen," said Gramacho director Lucio Alves Vianna. Gramacho sprang up on unstable, ecologically sensitive marshland overlooking the bay in 1978 and, for nearly 20 years, functioned with little or no oversight. There was no lining on the massive landfill's floor to prevent leaks of the toxic waste that was routinely dumped there, and the fetid juices produced by the rot of organic materials drained directly into the water, helping make much of the bay unsafe for swimming. In 1996, Rio authorities stepped in, ending child labor at the site, registering the catadores and restricting the kinds of trash the dump took in to just household waste from Rio and four outlying cities. Bulldozers started covering the picked-over trash with thick layers of earth. Now, with 12 layers each about 15 feet (5 meters) high, the 321-acre (130-hectare) facility has grown into a literal mountain of garbage overlooking the Guanabara Bay. Contamination concerns spurred plans to close the dump and tap into the energy created by the decomposition of its estimated 60 million tons of trash. More than 200 wells will capture the carbon dioxide and methane that emanate from the decomposing rubbish and pipe the gases to a facility run by Brazil's state-controlled energy company Petrobras. Sales of carbon credits and biogas are expected to generate about $232 million over 15 years, a percentage of which will go to payments to the catadores.