Already there are large companies which insist their component suppliers and other support subsidiaries meet strict environmental criteria. The crucial question is, does business just seek to comply with regulations, and avoid legal liability, taxation or insurance claims, or does it go beyond compliance? A tax per unit of pollution, or other environmental damage, does not discourage sudden discharges that can be difficult to monitor – it is better to adopt regulation that seeks to ensure that the capacity of the environment to cope with damage is not exceeded.