US weekly from Natural Resources Conservation Service: Water and Climate Update (PDF downloads) focusing on seasonal snowpack, precipitation, temperature, and drought conditions.
Water — Open Access Journal, peer-reviewed journal on water science and technology, including the ecology and management of water resources.
The USA’s National Institutes of Health (NIH) Office of Science Education offers curriculum supplements for K–12 science teachers.
Tracking microplastic pollution to its sources will usually require identifying the particular plastics and, only then, its likely sources. One of only two public-access databases can be used with the assistance of tech instructions published in Nature.com publication Scientific Data: “A Raman spectral reference library of potential anthropogenic and biological ocean polymer”
“NEMI is a searchable database that allows scientists and managers to find and compare analytical and field methods for all phases of environmental monitoring.”