Is it fair to attack Al Gore's meat-eating diet?

The anti-environmentalist, meat-eating pig?

Mr. Gore talks about the dangers of global warming and what should be done to fight the problem, yet Mr. Gore follows almost none of his advice. This is supposedly justified because his messenger position is more important than his personal actions.

Additionally, Mr. Gore claims the end of the world is upon us if we don't act and act swiftly. Yet many studies indicate that meat-eating is, ultimately, far more of a global warming problem than anything on which Al Gore focuses.

If Al is so concerned, shouldn't he, minimally, recommend reducing meat consumption if he is so concerned about global warming? How can Mr. Gore ignore, possibly, the greatest cause of global warming and be taken seriously?