Scholarly articles are written by experts in the field and, additionally, peer reviewed by a panel experts in the field. They tend to include a lot of research and data, and the information in the article is backed up by a list of references.
Example of a Journal with Scholarly Articles
Popular articles are often written by journalists for a general audience and are not reviewed by experts in the field. Popular articles rarely include references.
Example of a Magazine with Popular Articles
Articles from the New York Times, ranging from up-to-the-minute news on the topic to older, in-depth articles.
Ceased publication in May 2010, but still useful resource for news and content from the important journal, Nature.
Stories, podcasts and other media
British Broadcasting Corporation portal for global warming news coverage, with lots of multimedia options and RSS feeds.