Check out What if Everyone Consumed Like You. Unfortunately, if everyone consumed like I do it would take 5.3 earths to support us all, and I consider myself a fairly conservative consumer (good thing they didn't ask how many books I buy.) Play the game and let me know how many earths your clones would consume.
I've already made a change, though. The dumping of over five million pounds (I'm behind times times, the figure today is 21.7 million pounds) of E. Coli-tainted beef last week by Wal-Mart (and others) sickened me so much I can't think of eating cow, or pig, for that matter. All those animals slaughtered and then thrown away. (In case there was some lingering doubt which way my political winds blow...) Now I'm looking at chicken and fish (okay, yes, and yogurt. I'm working on it.) Of course, not everyone in the world has the choices I do. The fish seem to be gone in Nigeria. Thanks to Dr. Scanlan for this link.