"Meat is a wasteful use of water and creates a lot of greenhouse gases. It puts enormous pressure on the world’s resources. A vegetarian diet is better.... I think it’s important that people think about what they are doing and that includes what they are eating. I am 61 now and attitudes towards drinking and driving have changed radically since I was a student. People change their notion of what is responsible. They will increasingly ask about the carbon content of their food."The point he;s making here is that the methane released in direct emissions (farting) from cows and pigs is much worse than CO2. Thus going veggie would mean less of the animals needing to be farmed, so less farting.
At no point does anyone seem to have pointed out to him that if the entire world did go veggie, we'd all be farting much more and producing lots of methane. There would also be a horrible smell of brussel sprouts everywhere.