CRS Reports are produced by the public policy research arm of Congress and are heavily researched and written by experts in the field on legislative issues. CRS Reports are available fulltext from 1916 to the present.
Note: there might not be a crs report for every topic - but do try and see if there is!
Access via the Congressional Publications (Proquest) database.
Follow these steps:
cafo* and water
("climate change" or "global warming") and "national security"
biofuels and ethanol
"renewable energy" and biofuels
seafood and fraud
Results, notice you can change the display from relevance to sort by date (most recent first)