As today's IPPC report restates, the scientific consensus that humans are causing rapid climate change, a particularly lurid change to the weather has taken place in Siberia.
Scientists are still puzzling over quite why a blanket of strangely-coloured snow has fallen, but according to the Associated Press some Russian experts are absolving the usual suspects - local heavy industry - and pointing the finger at particles from neighbouring Kazakhstan.
Whether the fall is toxic or otherwise, Siberians are being warned (in the age-old wisdom of skiers and Frank Zappa): don't eat the yellow snow.
