On Thursday, Boris Johnson will host the second of the Mayor of London 2012 Debates, which he claims are "London’s intellectual contribution to the [Olympic] Games", and "will help define London’s vision for the next 15-20 years".

The title of the second debate is The Environment Imperative, and the Mayor’s website introduces it with the question: "How can London develop approaches to climate mitigation [sic] either as an economic response or in shaping the climate for investment in technological responses?" This is an important question. But the Mayor has made a bizarre choice of individual to answer it. The keynote speaker is Dr Matt Ridley, whom the website describes as “a renowned science writer, journalist, biologist, and businessman”.

Dr Ridley is all of these, but the website neglects to mention a few other important attributes of the speaker. The first is that his primary experience as a businessman was acquired as Chairman of Northern Rock bank, until his resignation in October 2007 in the wake of its catastrophic failure.

In its report on the bank, the House of Commons Treasury committee concluded: "The high-risk, reckless business strategy of Northern Rock, with its reliance on short- and medium-term wholesale funding and an absence of sufficient insurance and a failure to arrange standby facility or cover that risk, meant that it was unable to cope with the liquidity pressures placed upon it by the freezing of international capital markets in August 2007....The non-executive members of the Board, and in particular the Chairman of the Board, the Chairman of the Risk Committee and the senior non-executive director, failed in the case of Northern Rock to ensure that it remained liquid as well as solvent, to provide against the risks that it was taking and to act as an effective restraining force on the strategy of the executive members."

So Dr Ridley’s track record of dealing with the risks facing a business hardly gives cause for confidence in his expert advice about managing the global threat of climate change. Even more disconcerting is Dr Ridley’s affiliation to the Global Warming Policy Foundation, the pressure group set up by Nigel Lawson to campaign against the government’s climate and energy policies. Dr Ridley is a member of the Foundation’s Academic Advisory Committee, and wrote a report for it which hyped the potential of shale gas.

Dr Ridley has been a very enthusiastic promoter of shale gas, but has been prone to exaggerating its contribution to recent falls in greenhouse gas emissions by the United States. He also hates wind power with a passion. In a recent polemic for the Spectator, Boris Johnson’s former stomping ground, Dr Ridley falsely alleged that wind farms may increase greenhouse gas emissions. He then went on to announce that he was offering £8,500 a year from his personal wealth, not to compensate those who were left out of pocket by the Northern Rock fiasco, but instead to sponsor a new award, administered by the magazine, for "environmental heresy".

Not only is Dr Ridley profoundly opposed to some, if not all, of the renewable technologies that might help London reduce its greenhouse gas emissions, but he also plays down the risks that climate change poses. For instance, in a Times column (£) last month, he suggested that global warming has so far had relatively little impact on the UK. But he failed to acknowledge that seven of the warmest years on record have all occurred since 2001, or that by the time we can statistically detect the effect on extreme weather, it would be very difficult, if not impossible, to reduce the elevated concentrations of greenhouse gases in the atmosphere that are responsible. It seems Dr Ridley does not realise that a responsible and effective approach to managing risks requires action in advance to avoid the most damaging consequences.

At the very least, Johnson is missing a massive opportunity to stimulate public debate about how London might lead on climate change, which his strategy seeks to deliver. At the worst, it is a sign that the Mayor is in thrall to a very small band of climate change "sceptics", who could fill his head with inaccurate and misleading nonsense. Dr Ridley’s recruitment as a keynote speaker is not the only sign of this. Last month, the Mayor used his Telegraph column to promote the views of his friend Piers Corbyn, who has a small business offering weather forecasts. Corbyn is also a staunch climate change "sceptic", who denies that greenhouse gases are causing global warming.

London is home to many businesses and academic institutions that host genuinely world-class experts on climate change. Why is the Mayor not seeking their counsel instead of a fringe group of "sceptics"?