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Location: São Paulo, Brazil
Size: 7,000 tons per day
Type of garbage: Municipal solid waste
Health implications: Methane emissions
Located in Brazil's biggest city, São João has one of the biggest landfill gas-to-energy projects in the world. Consultant and engineering group ARCADIS estimates that São Paulo generates nearly 15,000 tons of trash per day. Its affiliated company, BIOGAS, extracts landfill gas from the São João landfill.