The National Science Foundation's Environmental Sustainability program (Grant ID 359589-F) is seeking grant applications for research that promotes sustainable engineered systems compatible with natural environments. The program supports four key research areas: Industrial Ecology, Green Engineering, Ecological Engineering, and Earth Systems Engineering. Proposals must be driven by engineering principles and involve graduate and undergraduate student participation. Proposals may also incorporate aspects of social, behavioral, and economic sciences. Prior to submission, applicants are encouraged to discuss their proposals with the Program Director. Proposals must comply with the NSF's Proposal and Award Policies and Procedures Guide. The typical award size for this program is around $100,000 per year, with a duration of one to three years. Proposals requesting substantially higher amounts may be returned without review. The program is open to all applicant types, and research may be conducted within or outside the United States, provided the potential benefit to the U.S. is explained. Faculty Early Career Development (CAREER) program proposals are strongly encouraged, with a July submission deadline.