What we learned this week

It was World Glacier Day this week, not that the glaciers knew much about it. Qianggong Zhang writes about the state of the world’s glaciers at Dialogue Earth, and why they matter.

Sainsbury’s is trialling a scheme where food waste from its stores is turned into biofuel, which will power 30 trucks at one of their distribution centres.

Iran is almost always mentioned in the news for other reasons, so don’t miss this story: the country is in a drought so severe that it is at risk of ‘water...