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.
Caffeine allergy symptoms resemble those of other allergies, and can even resemble mental problems like bipolar disorder, panic disorder, and attention deficit disorder. Most allergists perform a skin test or blood test to make sure that caffeine is the cause of the allergic reaction.