But isn't global warming supposed to be the single most important issue of all time?

Schwarzenegger injures knee, skips Tahoe C02 hysteria summit

Schwarzenegger's spokesman, Matt David, says the governor injured his knee recently and it was bothering him all week. He says a Border Governors' Conference the governor hosted in Hollywood this week and ongoing budget negotiations in Sacramento have kept him from getting it checked out until now.

Schwarzenegger is scheduled to return to work Monday.