Prof Beddington's comments come at a time when "climate sceptics" have been challenging claims by scientists that the release of CO2 into the atmosphere is increasing global temperatures.
And Giles Harrison believes climatesceptics need to apply the same scepticism to the cosmic ray theory as they do to greenhouse warming - particularly those who say there are too many holes in our understanding of how clouds behave in the man-made greenhouse.
Some climate change "sceptics" claim that this process, rather than the burning of fossil fuels, can explain much of the Earth's recent rise in temperature.
While the IPCC recently said it was more certain that climate change was happening, and that human activities were at least partly to blame, the sceptics say it has failed to explain several anomalies.