The Sustainable Forestry Initiative® (SFI) program is a comprehensive system of principles, objectives and performance measures developed by professional foresters, conservationists and scientists, among others that combines the perpetual growing and harvesting of trees with the long-term protection of wildlife, plants, soil and water quality. There are currently over 150 million acres of forestland in North America enrolled in the SFI® program, making it among the world's largest sustainable forestry programs.