A new study, widely reported in the press (e.g., LA Times), reports that mortality rates of a group of people studied were higher in those that ate red meat compared to those who did not. Indeed, NOT eating red meat was associated with reduced mortality rates.
If this is a robust result, it just illustrates that what's good for you is also good for the planet! And, if it's not, what's there to lose by eliminating red meat in your diet? You could gain a few years of life!