What is environmental hypocrisy?

What's worse: gas-guzzling or eating meat?

Recently Heather Mills showed up for a photo shoot to make the connection between global warming and eating meat in a gas-guzzling SUV. While Ms. Mills is right about the meat eating and global warming connection, there is also a big connection between gas-guzzling and global warming.
So does Mrs. Mills have a leg to stand on? Sadly, she does not - no pun intended.

Nonetheless, the point Mills is trying to make is a strong one, one that shows just how much of a hypocrite many environmentalists, such as Al Gore, are in the real world. Gore talks about how dangerous global warming is and buys carbon credits to offset the massive amount of pollution his mansion and jet-flying causes, but he could probably have a bigger effect on global warming by going vegetarian, yet this isn't part of Gore's inconvenient truth. Why?

Maybe the goal to being a good environmentalist is to do less lecturing and more living by example?

Rate environmental hypocrisy: Are most environmentalists hypocrites or is it just the stars of the environmental movement - those from Hollywood, etc - that give environmentalists a bad name?