I almost never eat beef. I eat mostly chicken and fish, but there are a good number of meals where I don't eat meat at all.
Chicken is still bad for the enviroment... due to the resources it takes to grow.
The whole meat industry is nearly at 20% of manmade emmissions. Which sounds like a lot when it comes to global warming, no?
Espiecally when considering that even once we develop clean energy technology a lot of poorer countries aren't likely to be given it.