These SFI principles are further refined in the SFI Standard found at www.forests.org. Among other requirements, SFI program participants must meet or exceed applicable water quality laws and regulations, with measures to manage and protect water bodies and riparian zones on certified lands. They must continually evaluate habitat and biodiversity impacts from forest activities – this leads to improved habitat quality, and protection of imperiled or critically imperiled species. SFI program participants must comply with the comprehensive forestry laws that apply to them in the United States and Canada. They must practice responsible forestry on their certified lands, as well as promote best management practices, awareness and training if they procure wood from lands in North America that are not certified. The SFI program is committed to improving the practice of forestry on all forestlands in North America, whether boreal forests or plantation forests, whether naturally regenerated or planted. Its philosophy is that healthy, productive forests yield immense environmental, social and economic benefits, and mitigate the impacts of climate change by absorbing and storing carbon in trees, soil and biomass. Forestland being converted to other uses could not be certified to the SFI Standard because it would not meet the requirement calling for prompt reforestation after the final harvest.