Climate change has become a proxy subject for people who just want to sound off

I know Alistair Darling had left Loretto School, Musselburgh (for Aberdeen University) shortly before Andrew Marr had arrived (en route to Cambridge), but it was still odd to see the pair of them on my television last Sunday. Odd, I mean, that neither mentioned that they’d been to the same top Scottish public school, even though they were discussing whether it mattered that David Cameron had been to an English one.