Should dietary guidance advice encompass environmental issues?
The federal government's Dietary Guidelines for Americans document does address some issues beyond just diet, including both physical activity and food safety. For a number of reasons, environmental issues are not yet included.
But several interesting efforts have gone further.
A classic source is the 1986 article "Dietary Guidelines for Sustainability," by Joan Dye Gussow and Kate Clancy (may be gated).
One more recent resource, which incorporates environmental issues into a dietary guidance graphic akin to MyPyramid or MyPlate is the Barilla Double Pyramid: "Good for you, sustainable for the planet."
Another resource, from Fall 2012, is the "Good Food on a Tight Budget" guidance from the Environmental Working Group. In this video, EWG's Dawn Undurraga -- a Friedman School alum and former U.S. food policy student -- explains how the guide combines both diet and nutrition issues.
The most droll line in the video comes from a chef, who said (unless I misheard it!): "Income is not consistent with my life right now."