Taxing food with high carbon emissions seems like a rational, reasonable, and feasible step that governments should take. It seems like the logical thing to do. Raise the price, lower the demand. Tax food, reduce climate change. Or does it? I talk with Dr. Ariane Kehlbacher from the University of Reading about introducing a carbon food tax to combat the negative effects our diets can have on the environment.  We first discuss the theory behind the tax, before delving into the issues that surround and complicate the initiative. It's not just what gets taxed, but who.