In a better world, Mr. Wallet Mouth and I would not be quite as addicted to cheese and yogurt as we are. Which is to say, we'd be vegan. As it is, we are hardly in a position to cast stones, but it's good to be reminded that an animal-product-free diet is much lower impact than any other, as this analysis by Adam Stein at the TerraPass blog makes plain.
If, like Mr. Wallet Mouth and me, you can't quite go all the way, perhaps you take the carbon footprint of your meal is as one more reason to go easier on the more sinful choices at the dinner table. Or to try cutting back on meat and dairy a set number of times per week. Or, following the chart, resort to a diet of only oils, sweets, and condiments. (Ha!)