SAN FRANCISCO - MAY 12: Recology CEO Michael Sangiacomo (L) looks on as San Francisco Mayor Gavin Newsom (R) speaks to reporters following a tour of 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.