Climate models show that the additional particles caused by human activity produce a cooling effect which partially offsets the greenhouse effect. (sciencedaily.com)
While all eyes were turned on carbon dioxide, almost by chance a few researchers discovered that other gases emitted by human activity have a greenhouse effect strong enough to add to global warming. (history.aip.org)
Despite attempts to locate monitoring sites in places not affected by human activities, the stations are picking up signals of human influence throughout the Caribbean basin. (sciencedaily.com)