Dr Habibullo Abdussamatov of the Pulkovo Observatory in St Petersburg, and also the Director of the Russian segment of the International Space Station in his classic paper "The sun dictates the climate" delivered at the 4th Heartland Institute International Conference on Climate produces clear evidence that as far as the sun is concerned there are two Total Solar Irradiance(TSI) cycles the 11 year cycle and the two century cycle. However it is the two century grand solar cycle that plays a dominating role in the solar physics of the sun. This enables one using the data from sunspot activity to show the course of the TSI during the past and predict future climate variation. Using this data and the two century cyclic variation of the TSI Abdussamatov shows that the earth is heading for a cooling similar to the Maunder Minimum of 1645-1715 when global temperatures fell by 1.5 celsius. He predicts that this deep cooling will last right to the end of the 21st century with warming only starting again well into the 22nd century. So we should prepare for the effects of deep cooling which will be much more devastating than a global warming.