We had the luxury that we got it in place by the beginning of 2005, which meant that we had three years before the Kyoto commitment period when it became absolutely vital to have the ETS to help us meet our commitments. So we were lucky. But it is a big endeavour, so it does take some careful thinking.
That said, we were the first to do such a big scheme for CO2 emissions. We learned a lot from the U.S. from the NOx and SOx trading schemes. We're making real efforts now to make sure that other people can learn from us. So we're one of the partners in the ICAP, the International Carbon Action Partnership, which was mentioned by Vicki Arroyo, to help share knowledge and experience to get better-designed ETS schemes in the future.