IT's true, the earth has been warmer in the past. In fact it was warmer in the early to mid 1800's than it is now, when we entered the 'Little Ice Age' which ended about the late 1920's. It's not so much the total temperature that I'm concerned with, its the rate at which it is increasing. I can show you VOLUMES that refute that speech.
I'm with 1 on this. All the reasons why, whats going on, when will it reverse, all these unanswered questions.... true facts, not just speculation. All the unknowns about it are THE concern.