For specific online databases, use the Databases A-Z page under FIND INFORMATION. There is a list of databases under ENVIRONMENTAL SCIENCEin the SUBJECTS box on the left, or use the alphabetical jump bar for a specific database title, like SCIENCE DIRECT.
Full-text Databases: Full-text of the articles are in that database
In the last 5-7 years, scholarly publishing has been plagued by explosive growth of bogus scientific journals, sometimes called "predatory journals."
Library databases will screen out these fake journals for you, but if you are picking something from the public internet, you need to add an extra step to your research. You need to make sure the article you are looking at comes from a genuine peer-reviewed journal.
There is a library database called Cabell's Blacklist that lists predatory journals.