This is based on several potentially faulty assumptions first the trust fund may not be aimed at helping to prevent pollution of clean up afterwards; it may simply be given the role of generating the biggest possible return. Second it assumes that politicians see themselves as tied to the people so that they have a reason to prevent pollution, in practice in an autocracy or a faulty democracy this may not be the case. The desire may therefore be to invest as much money as possible in the trust fund and therefore to exploit the resource as fully and cheaply as possible. Even if the money is going into a trust fund the self interest is in polluting as we should remember that dictators are likely to believe they will still be around to see the benefits in decades to come.