I agree keeping or killing animals in an inhuman way is wrong, my meat comes from local organic free range farms, the animals are cared for properly and there is hardly any CO2 food miles on the meat. Its the same for most of our vegetables and fruit.

But being a vegan, well its not quite so virtuous as it first seems, at least not unless you are extremely careful... eat avocados or lettuce, they take huge amounts of water to cultivate and are often shipped on long distances using up lots of CO2. Sugar is also terrible, pushing ecoststems to the brink through over farming, and soy is linked to groundwater contamination and deforestation of the Amazon.

The point is, there is no single 'lifestyle' that fixes all the problems, you have to care enough to know how your food is produced and where it comes from.

Im personally looking forwards to the implemenatation of block-chain in making this knowable, a company in the UK Provenance are trying to make products including foods have a fully traceable history through block-chain. I also met some guys who invented hardware to track where fishing vessels were to ensure catches were within compliance, so you could then track the catches.

Block-chains will be huge in supply chain, and will tap into customer demand for more informed choices, so stay vegan, but make sure you are the best vegan you can be ;)

EDIT: Upvoted myself here because I feel Im providing some factual information that people may not see if its buried at the bottom of the posts. No hubris intended.