Oh my. This article is just a bunch of rethorical fallacies and flawed arguments.

"For example, many vegetarians cite the sentience of animals as a reason to abstain from eating them. But there’s good reason to believe that plants are sentient, too. In other words, they’re acutely aware of and responsive to their surroundings, and they respond, in kind, to both pleasant and unpleasant experiences."

Whenever you read something like this in a piece about vegetarianism/veganism, run as fast as you can. Your own QI is at risk from the exposure to such bullshit.