The increase in the average temperature of the earth's near surface air and ocean since the mid 20th century and his projected continuation is known as GLOBAL WARNING. Global surface temperature increased 0.74+/-0.18degreecelsius(1.33+/-032degreefareheint). Human activities such as fossil fuels burning and deforestation caused most of the observed temperature increased since the middle of the 20th century.
The IPPC also concludes that variations in natural phenomena such as solar radiation and volcano produced most of the warming from pre-industrial times to 1950 and had a small cooling effects afterwards, How can we control this if it goes out of hand?