Not going to enter into a vegan/veggie/omnivore debate but as we're talking numbers it's worth noting that the CO2 figures for meat use a global average that includes very poor feedlot practices ... UK beef production methods, being pasture based, only emit a third of the global average per Kg ... so if you eat British beef then the saving for going Vegan would only be 5%
There's the likes of the tons of plastic Halloween/Xmas tat bought off the shelves to placate whining brats that will be in the bin on it's way to landfill the next day .... plenty of utterly useless excess that can be cut out first
K