Using older data collected for the theory, as far back as a hundred or more years ago, scientists argued over if the globe was cooling or warming. <ref>http://www.saveportland.com/Climate/index.html</ref> | Using older data collected for the theory, as far back as a hundred or more years ago, scientists argued over if the globe was cooling or warming. <ref>http://www.saveportland.com/Climate/index.html</ref> |