I want to start out by saying that I'm a massive hypocrite given that I'm seriously keen on eating meat. But all the same, it's clear that there are environmental concerns, and also moral ones, about eating meat on such an industrial scale. A first step in the right direction is clearly to make sure that you source meat products as locally as possible, from known suppliers that don't abuse their animals and ensure that the animals have as happy a life as possible (up until their premature death, at least), which addresses both partially. If nothing else, meat is better-quality if it's sourced from a healthy animal that was given a good diet and proper living conditions.
But at some point it's hard to see how we won't naturally move towards sourcing meat from sources that were never technically alive. One obvious trend in the history of the world is regarding fewer and fewer things that are sentient as "property" (slaves, wives, employees, etc. etc.). Animals will, in time, be likewise treated as more than just "stock".