I think the principle here is that, actually, we've got to take some responsibility for what it is that we're consuming. We're consuming steel; we're consuming aluminium. Wherever in the world it comes from, we do have an obligation to work out how to deal with the emissions that arise from the industrial processes that are associated with the products that we consume and rely on; and that means getting into the really thorny issues of how to measure, manage, price, and ultimately to change the technologies in those industries, and we're really keen to partner with those industries in order to do that.