I don't think it's any more difficult to establish the historical record on greenhouse gas emissions than it is to establish the historical record of a company that has been polluting a site, say, for an awfully long time. We actually have the evidence. Economic historians do know how much carbon dioxide has been emitted by industrial countries over the years. There is a record of coal burned. I'm an economic historian, and I can tell you there is a pretty good record of what the burn rate was, literally, of coal in the 19th and 20th centuries by major industrial powers. That was the chief source of greenhouse gas emissions. That record is well known. There is an absolute correlation between the coal burned and the energy used and the economic success that accrued to those countries that did it first. That's what the Industrial Revolution was about. It is a known fact.
In terms of the principle of the thing, just as we would go back and try to penalize a company that over the years has built up its fortune by polluting a piece of ground, we're basically invoking the principle that one day or another the polluters have to pay, even if they didn't recognize at the time that's what they were doing, because the result of that activity was their wealth. They grew their wealth based on those emissions associated with energy consumption. That is the story of the Industrial Revolution, and it's known.
It is interesting that the UNFCCC said at Bali--and the minister did not contradict--that given that historical record, developed countries should see their reductions being at a minimum by 2020, with regard to 1990 targets, 25% to 40%. That is the conclusion you draw: you did it; you can't get away with it simply because you grew, or by saying that was then and this is now. You have to recognize how it is you got to be rich. That's how the west got rich, and they have to pay for it. We have to pay for it.