The city of San Francisco is 47 square miles of innovation - an incubator for new ways to solve old problems, a living laboratory for environmental and economic sustainability. As old as the Declaration of Independence, San Francisco is a blueprint for the future. It remains today the world's leading breeding ground for game-changing ideas and amazing technologies that reimagine the way we live and communicate, and preserve the best aspects of our world. A pioneer in the recycling movement, it continues as a national leader in the full spectrum of local sustainability practices.