Global warming may heat up Earth more than expected in future

Climate sensitivity depends on a number of properties of the earth’s climate system, such as the composition of clouds and cloud cover.
Earth could get much warmer than expected in future, say scientists who have reconstructed past global warming and carbon cycle on earth 56 million years ago.
Global warming from greenhouse gas emissions depends not only on the size of the emissions, but also on the warming effect that the extra amount of gas has on the atmosphere.
This effect, calle