Global Warming Believer. Defined. (Adj.) A person who chooses to believe that the earth is heating up due to man made causes and refuses to read actual research that the earth has actually been cooling down for the last decade or more. A person who either doesn't know because they were government school educated and refuse to think for themselves or they ignore the fact that some years back these same class of scientist screaming about Global Warming were swearing that we were headed for the next Ice Age.