identifier-a symbol that establishes the identity of the one bearing it. variable-a symbol (like x or y) that is used in mathematical or logical expressions to represent a variable quantity.. (Psychoanalysis) psychoanal the end product, in the form of an object or act, of a conflict in the unconscious between repression processes and the actions and thoughts being repressed: the symbols of dreams. 5. (Psychology) psychol any mental process that represents some feature of external reality.
By my definition, out of 13,950 peer-reviewed articles published on global warming since 1991, only 23, or 0.16 percent, clearly reject global warming or endorse a cause other than CO2 emissions for observed warming.
Various surveys have been conducted to evaluate scientific opinion on global warming. They have concluded that the majority of scientists support the idea of anthropogenic climate change. In 2004, the geologist and historian of science Naomi Oreskes summarized a study of the scientific literature on climate change. She analyzed 928 abstracts of papers from refereed scientific journals between 1993 and 2003 and concluded that there is a scientific consensus on the reality of anthropogenic climate change.