I'm not at all happy that Al Gore decided to politicize natural variability. We had ice ages and warming periods all through history. Some of it was recorded history, but some was also the manifest history of the planet. To assign a variable to man is to fail to appreciate how enormous the biosphere is. At the outer edge, it reaches 0 degrees. At the occluded front it reaches 70ª deltas in temperature.
While only a charlatan would indict man, only a politician would indict humanity and demand that we pay for that sin while totally obfuscating the fact that there is literally no way to make it better.