Meat the top cause of global warming?

Look for someone with a cause other than helping the environment when they say "X is a big cause of hurting the environment".

For the practical minded, the best thing you can do to help the environment is to move to a place where you don't need much AC or much heating, but the latter matters more. Good Insulation do much more than almost anything else to decrease your footprint, but it isn't sexy and you can't show it off to the Jones next door.

I look forward to hearing what Woz has to say, now that he's on his quest for efficient homes.