All because of a reduction in solar activity.
At the National Astronomy Meeting, researchers presented predictions that we may have a slight ice age by 2030. The study, announced by Professor Valentina Zharkova of the University of Northumbria, was based on computer-based sunspot models - she said the model would be extremely accurate, with 97% correct when mapping previous movements of solar activity.
If the predictions remain correct, by 2022, a portion of waves will move to the end of the northern and southern hemispheres of the sun, which would reduce solar activity. Eventually the two waves would be in sync, peaking at the same time, but in opposite hemispheres. This would cause what is called by Maunder's minimal climatologists.
Maunder's minimum was a 70-year period from 1645 to 1715. The sun produced few sunspots and this led to a small 'ice age' - parts of Europe and the US had extremely intense winters, with the river Thames, from London, freezing for 7 straight weeks (even rolled up festivals on the river!).
These conditions are expected over the next 15 years, but it is noteworthy that events are independent of global warming caused by human activity. One thing is the reduction of solar activity, the other is the increase in temperature caused by the greenhouse effect, deforestation and gas emissions. So it does not mean that we should forget about environmental responsibilities when expecting cooling from the sun.