These general databases are useful for finding a variety of sources on controversial issues related to a full range of science disciplines. The sources include long form newspaper articles, op-ed pieces in professional and peer-reviewed journals as well as scholarly articles and multimedia.
A free, publicly available search engine that searches over 300 authoritative science and technology collections.
BioOne (http://www.bioone.org/) searches over 200 leading titles in the biological, ecological, and environmental sciences.
WorldWideScience (https://worldwidescience.org/) is a global science gateway to national and international scientific databases and portals.