It's a "feel" kind of thing....kinda like the "wind-chill index" they tout on the evening weather.

Although I'd bet a wooly mammoth put out more methane than a herd of cows, and we still had that pesky ice age...perhaps I'm off in my creationist timeline though.
Wanna hear a nutjob on global warming? Find some stuff from Kent Hovind! He's a hoot...well maybe just to me...but I bet TA would find him to be a pretty good view, too!
Ya gotta like opening up the TA on the highway, that rumble...the gas smell just pouring through the vents...that just tells you it's WORKING! I can't get over how much I love that feeling every time I tromp on the gas and that big V8 gets up and GOES! Just when I'm getting up to cruising speed, those little 4-bangers are starting to develop a hitch in their giddyup!
'Mercan muscle. God it's great!
