The World Stewardship Institute (WSI) is a California-based nonprofit organization focused on promoting environmental stewardship. It brings together religion, science, and ecology to address issues related to climate, energy, forestry, wilderness, oceans, and politics. WSI conveys the formal positions of religious groups to the U.S. Congress, the White House, and other government departments. It also engages clergy, primarily from Christian and Jewish faith traditions, to advocate for the protection of the environment at both government and community levels.