Mexico City has announced plans to close one of the world’s largest open-air garbage dumps as part of an initiative to convert more of the city’s waste into reusable materials or energy. By the end of the year, garbage trucks will no longer be allowed to drop trash at the Bordo Poniente, a massive dump that has received more than 76 million tons of trash since it opened after the devastating 1985 earthquake. At its peak, the dump received about 12,700 tons of garbage daily. A recycling separation facility and composting plant will remain open at the site. According to a plan announced by city officials, a large concrete company, Cemex SAB, will buy 3,000 tons of trash daily to convert into energy. Mexico City is searching for other dump sites to use until a new recycling program is instituted in 2012. Meanwhile, Seattle became the latest U.S. city to ban plastic grocery bags and also passed a 5-cent fee on paper bags in an attempt to reduce its waste stream.