<human>:  How much of the increase in global temperature is due to human activity?
<bot>: The increase in global temperature is due to a combination of natural and human causes. The natural causes are primarily due to the sun, and the human causes are primarily due to the burning of fossil fuels. The exact amount of the increase in global temperature due to human activity is difficult to determine, but it is estimated to be about 0.8 degrees Celsius.