Romantic environmentalists tend to get the big-picture problems right, while fudging the details. Rationalists nail the details, but sometimes become so immersed in the minutiae that they lose sight of the big picture.
I don't agree with Johnson on the total big picture, but I greatly respect his willingness to look at the holes in some foodie arguments.
A more ascerbic person might consider "fudging" to be the same as "lying", but today I'm feeling generous, and willing to admit all parties have their myths: liberals, conservatives, foodies, production ag.