Scientists say that doubling pre-industrial carbon dioxide levels will likely cause global average surface temperature to rise between 1.5Â° and 4.5Â° Celsius (2.7Â° to 8.1Â° Fahrenheit) compared to pre-industrial temperatures.
Furthermore, they may experience withdrawal symptoms that can include headaches and irritability, perceived loss of performance both physically and mentally. People suffering with intolerance to caffeine have reported feelings of disorientation, loss of judgment, anxiety, dizziness, agitation and a hyper activeness.
Clinically, the symptoms of caffeine intoxication can mimic those of psychosis (Kruger, 1996) or be confused with the side-effects of medication (Hughes et al, 1998). Cessation of caffeine causes fatigue and drowsiness, which can be confused with the side-effects of psychotropic drugs (Hughes et al, 1998).