Environmental Topics Guide -- from the EPA, this is a page that will direct you to information the EPA would like the ordinary citizen to know about environmental topics. You can also find technical reports with recommendations.
NASA's Explore Earth page -- NASA studies Earth Science -- here you can find educational and research materials on how NASA studies environmental topics
Take a look at this list of professional organizations for environmental engineers -- search their websites to see the very latest news, events, etc. on your topic.