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.
Top 15 Caffeine Withdrawal Symptoms. 1  Headache. A caffeine headache usually starts behind the eyes and then moves up the front of the head. 2  Sleepiness. This just isnât your normal tiredness, this is sitting up straight but still canât keep your eyes open tiredness. 3  Irritability. Everyone and everything gets on your last nerve.  Lethargy.