burning of fossil fuels produces myriad types of greenhouse gases. usually, green house gas is important to keep the earth's temperature normal without being too cold. unfortunately, increase of fossil fuels burning in recent years have lead to excessive amount of the greenhouse gas in the atmosphere, which causes too much heat from the sun to be trapped in the earth atmosphere.
accelerated heartbeat, raise in blood pressure, slow in digestion, raise in blood sugar and perspiration. (myers' psychology for ap 2nd edition pg 87)