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.
Other symptoms seem more severe, and call for immediate medical treatment. These more serious symptoms of caffeine overdose include the following: 1  trouble breathing. 2  vomiting. 3  hallucinations. 4  confusion. 5  chest pain. 6  irregular or fast heartbeat. 7  uncontrollable muscle movements.8  convulsions.here are several types of symptoms that come with this condition. Some symptoms may not immediately alert you to the fact that you have had too much caffeine, since they may not seem serious. For example, you may experience: 1  dizziness. 2  diarrhea. 3  increased thirst. 4  insomnia. 5  headache. 6  fever. 7  irritability.