Cool Green

Can pumping wastewater from the oil industry underground cause earthquakes? / The ExxonMobil pipeline spill in Arkansas / Combatting ash dieback by planting more trees / Stricter sulphur limits for car fuels in the US / Are MSC-labelled fish being mislabelled? (Answer: No) / Will Pope Francis be the greenest pontiff yet? / Breeding frogs in captivity to save a species   (Photo: Penelope Clay)