Datapages is the digital publisher for the American Association of Petroleum Geologists. Founded in 1917, the American Association of Petroleum Geologists is currently the world's largest professional geological society. Datapages archives and catalogs the AAPG’s geological publications, like AAPG Bulletin, Journal of Petroleum Geology, Journal of Sedimentary Research, and Bulletin of Canadian Petroleum Geology to name a few. The full-text of the articles in these publications is readily available. Access to AAPG Datapages has been provided by Robert J. and Elizabeth Lee Dean Ardell (1974 alumna).
If you are searching for information on the topic global warming, you would need to cause the search engine to respond to this as a phrase rather than as just two words anywhere in a document.
To indicate that this is a phrase to be searched, “global warming” is the way to do it. And if you do, there are 149 full-text articles from such sources as Journal of Sedimentary Research, Search and Discovery, AAPG Bulletin and others.