My constituents will be extremely pleased to hear what the hon. Member for Southwark and Bermondsey (Mr. Hughes) has to say, because it is their jobs that will be at stake. Will the hon. Gentleman address his mind, before making immediate demands for a complete clean-up of chemical and other industries, which are already making a significant effort to this end, to the time scale? He is right to say that research will yield technically feasible options for cleaning up waste streams and so forth; it is a question of how long one has in which to do it. My hon. Friend the Member for Walthamstow (Mr. Summerson) is absolutely right: if all these waste streams had to be stopped tomorrow morning, ICI, Monsanto and a number of other companies would be stopped tomorrow morning.