I teach energy policy. The title of the course is Sustainable Energy Policy. There is no easy answer to that question. It is possible that biofuels have a role in an energy strategy aimed at sustainable development. But, not necessarily. It's complicated.
The same applies to carbon capture and storage. It may be part of a healthy strategy to resolve climate change issues, but not necessarily. Debate and studies in this area are what is needed; it's not a simple problem. Also, the famine issue in many countries is not only attributable to biofuels.