Nature in the City is a fiscally sponsored project of Earth Island Institute, a 501(c)(3) nonprofit organization. All donations are tax deductible in the United States. Our federal tax identification number is 94-2889684. Your credit card statement will show the donation as a charge to Earth Island Institute (not Nature in the City). Our mailing address is Nature in the City, PO BOX 170088, San Francisco, CA 94117. Earth Island is an environmental organization providing fiscal sponsorship to more than 75 projects. They are committed to sound fiscal management, accountability, and transparency. Earth Island is highly rated by the top charity rating services, and you can view their financial reports here.