Sustainability Impacts Policymakers brandishing climate change and sustainability as their objectives may find adverse impacts hitting their home markets harder. Part of the mantra that is supposedly better for the environment is short supply chains. Using policy to shorten supply chains rather than allowing their length to be determined by economic efficiency is just another form of protectionism. Shortening supply chains will inevitably cut both ways, making net food exporters larger victims of the policy.  For example, if carbon taxes are applied fairly, exporters of wine, beer or distilled spirits would more easily get outcompeted by domestic suppliers. Suppliers of value-added products would be hit worse since usually the added...