'm so glad that I don't eat too much meat and also consume a lot of vegetables. My diet keeps me pretty healthy and fit, and affords me the opportunity to, unlike Mr Bittman, NOT have to wring my hands too much over how much my eating contributes to global warming.
Of course, I am not off the hook entirely, even the produce I consume organic and otherwise contributes to global warming in a variety of ways. Crops don't absorb as much CO2 as the forests and grasslands they replace and the fallow fields reflect much more heat into the atmosphere than natural vegetation.
Even the best managed land loses topsoil which runs off into streams and rivers thereby increasing heat absorption by the water.
It's too bad that I was not born closer to the end of the Pleistocene, when global warming had finished off the last vestiges of the great continental ice sheets, and the forests and plains of what would become the temperate regions were aborning. I read that the hunting was great back then, farms had not yet been invented and the warming of the climate that continues to the present was in no way anthropogenic.
AND, there was no omnivore's dilemma.