S:
Sustainability: Science, Practice, and Policy - An open-access scientific on-line journal supporting the dialogue emerging out of the field of sustainability. Peer-reviewed content. [Department of the Interior, U.S. Geological Survey (USGS), National Biological Information Infrastructure (NBII)]

U:
United States Global Change Research Program - Coordinates and integrates federal research on changes in the global environment and their implications for society. [Multiple agencies involved]