Sir – Surely Chris Koenig’s informative article (Business, August 9) on “the thorniest of issues” merits more follow-up than Malcolm Nichols’s letter Utilities under strain (August 16).

Perhaps the reason for the lack of response on such a fundamental issue is that people feel that there is nothing that they can do about it. Fortunately, this is not the case.

I would like to refer readers to the website populationmatters.org and to recommend the talk that will be given by Professor John Guillebaud, at the Cafe Scientifique, in St Clement’s, at 7.30 pm on Tuesday, September 11, entitled Is sex the most dangerous human activity?

Simon Mollison, Oxford