Increasing numbers of commercial, industrial and environmental products and processes are using nano-enabled systems. This 4th GRC on environmental nanotechnology will focus on nano-enabled products, including better understanding of the interaction of nanomaterials from these products and the environment through metrology and basic understanding of interactions with biological entities. In addition we will discuss public perception of nanomaterials and how we as scientists can better frame the public discussion surrounding nanomaterials. In the past decade, the scientific community has made great advances in research evaluating nanomaterials that may eventually be used in consumer products and their eventual distribution in to the environment. This meeting will discuss the next steps in the field and projecting into the future. The meeting will focus on topics such as advances in nanomaterial design and development for creating the next generation of materials, as well as the new applications that are being developed for these materials. These applications range from fabrication and unique properties of highly novel nanostructured materials that are, as yet, underutilized in such applications (e.g., 2D nanostructures, soft nanomaterials, and bio-nanocomposites to innovative applications of both established and emerging nanomaterials to address grand environmental challenges related to resource security and sustainable development (e.g., carbon capture and conversion, nano-enabled membranes at the energy-water nexus, and sensing technologies for real-time environmental quality monitoring). The applications of materials for food and agriculture will also be discussed and their negative but also positive implications for the environment. In addition the development and application for characterization of in situ characterization techniques to reliably measure the extrinsic properties, or those that depend on the surrounding environment will be explored.