New Matilda: With the recent dramatic collapse of the ice bridge to the Wilkins Ice Shelf in Antarctica, climate change is back in the headlines. But Malcolm Turnbull and Coalition environment spokesman Greg Hunt think they have an answer: biochar. Many of the world’s top climate scientists, including James Hansen, agree with them. So what exactly is biochar? Will it work, and can it save us? Essentially, biochar is charcoal — the burnt remains of organic material. The CSIRO has …