Biochar is being hailed as a possible "silver bullet" solution to climate change -- a form of charcoal formed by slow-cooking waste plant material that traps carbon for hundreds of years. But critics claim the environment could suffer if natural habitats are given over to biochar production. One small-scale experiment in England is looking to refine the art of cooking wood for maximum environmental benefit. Duration: 02:06
Having trouble viewing this video? Try downloading the latest version of Flash or contact your IT department.
If you have a video that you think we should run, send a link to email@example.com.