MARIO LAPORTA/AFP/Getty Images

Malagrotta Landfill

Location: Rome
Size: 1.46 million tons per year (approximately 4,000 tons per day)
Type of garbage: Municipal solid waste
Health implications: Methane emissions

Possibly the largest landfill in the European Union, this landfill is nearing capacity. U.S. company Solar Integrated Technologies won a $10 million contract for a solar energy project at the landfill in 2007.

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