Yawn
It's not hard to demonstrate that growing lettuce in (say) a desert has more environmental impact than growing a camel or a goat there. Whereas growing lettuce in my garden, fed by my lawn clippings, has considerably less environmental impact than growing a camel there, what with the food-miles it would cost to import camel food from, er, wherever it is they make camel food. We can all play the the carefully-select-your-context-to-suit-your-polemic game, it's not clever and it certainly isn't telling us anything useful.
But there is one interesting aspect to this article - does it indicate that Lester has inherited the Register's official hippy-baiter-in-chief office from Lewis Page? Surely there should have been some kind of handover ceremony, accompanied by a generous quantity of bacon sandwiches and a hired chorus of close-harmony climate-change-deniers..?