Telegraph: Important factors like the melting of frozen Arctic soil, which are expected to contribute significantly to global warming, have been left out of scientists' calculations because the size of their impact remains unclear.
It means that models which will be used to inform the latest international assessment of climate science, to be revealed on Friday, "substantially underestimate' the scale of the problem, Lord Stern of Brentford claimed.
The former World Bank chief economist, who authored an...