. >> the geological association of america talked about a new era through human activity. >> there is no dispute whether something is changing in the climate. there is no dispute there. the question is, what needs to be done or what can be done? >> i think we need to project forward what is likely to happen on the basis of the best scientific evidence. and that is provided. and work out the economics. only do things for the costs are less to the benefits. that is what we should be doing. i have assessed the report and looking at it he says, even on his worst scenario, if we take the action he proposes, the costs will exceed the benefits for the first century. we're talking of doing something where any returns will accrue more than a century hence. should we be doing that? the green party may think so. >> if you want to stop flying -- >> we do not want you to stop flying. >> let's be sensible. you are being unfair to the green party. >> what we would like to do is to localize our industries and bring farming back into the u.k., stop flying beans from kenya. we want to bring industry ba