SAN FRANCISCO - MAY 12:  San Francisco Mayor Gavin Newsom (C) and Recology CEO Michael Sangiacomo (L) tour a construction material recycling facility at Sunset Scavenger May 12, 2009 in San Francisco, California. Mayor Newsom annouced today the city of San Francisco leads the nation with a 72 percent recycling rate. A new mandatory ordinace to recycle coompostable materials will begin this week following the mayor's successful construction debris recycling ordinace that accounts for the lowest tonnage sent to landfills in over 30 years. Getty Images logo Getty Images 6 months ago

SAN FRANCISCO - MAY 12: San Francisco Mayor Gavin Newsom (C) and Recology CEO Michael Sangiacomo (L) tour a construction material recycling facility at Sunset Scavenger May 12, 2009 in San Francisco, California. Mayor Newsom annouced today the city of San Francisco leads the nation with a 72 percent recycling rate. A new mandatory ordinace to recycle coompostable materials will begin this week following the mayor's successful construction debris recycling ordinace that accounts for the lowest tonnage sent to landfills in over 30 years.