There are several databases that you can use to find scholarly an magazine articles on your research topic related to Global Warming.
Applied Science & Technology Full Text: Wilson Omnifile
Provides full text articles on science and technological subject areas including global warming, climate change and policy issues.
Biological & Agricultural Index : Wilson Omnifile
Full text and Abstracts of Journal articles pertaining to Biology and Agricultural research.
BioOne
Offers an aggregation of full-text, high-impact bioscience research journals, mostly published by small societies and non-commercial publishers. Provides access to full text articles on Global Warming.
Columbia Earthscape
Columbia earthscape is a comprehensive aggregation of resources in the Earth and Environmental Sciences. See Research by Issue: Climate Change for comprehensive information on climate change.
Engineering Village
The combined Compendex®, Ei Backfile & Inspec® databases allow for searching on a broad range of topics within the scientific, applied science, technical and engineering disciplines.
Environmental Engineering Abstracts
Coverage of the world literature pertaining to technological and engineering aspects of air and water quality, environmental safety, and energy production, with over 700 journals indexed.
General Science Full Text : Wilson Omnifile
The General Science selection of Wilson Omnifile provides fulltext to sholarly and popular journals covering research and innovation in the sciences.
Proquest Research Library
Proquest General Reference provides abstracting and indexing for over 2100 titles, including full text for over 1800 journals. It is an interdisciplinary database and can be used to find citations and some full text for numerous subject areas .