Here’s a quote I came across in a zine I picked up recently.

Everyone has a limited amount of time and energy, and time taken in active work for one cause reduces the time available for another cause; but there is nothing to stop those who devote their time and energy to human problems from joining the boycott of the products of agribusiness cruelty. It takes no more time to be a vegetarian than to eat animal flesh… When non-vegetarians say that ‘human problems come first’ I cannot help wondering what exactly it is that they are doing for human beings that compels them to continue to support the wasteful, ruthless exploitation of farm animals.”

– Peter Singer, Animal Liberation