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.
Some symptoms of caffeine withdrawal include severe headaches, depression and feeling sleepy. People who withdraw from caffeine too quickly may suffer severe headaches. Common symptoms of caffeine withdrawal include nausea and vomiting. Someone who is withdrawing from caffeine may suffer from insomnia.