Delusion is not a necessary consequence of becoming a Conservative supporter. Yet in Mark Lynas's case this seems to have been one of the results. Lynas's attack piece on Liberal Democrat energy policy was one of the most delusional pieces of writing I have read in a long time, and utterly lacking in foundation.

Lynas accuses me of ignoring the "science" and laments my comments on BBC Radio 4 on the health effects of nuclear power. According to him, there is no plausible scientific case for this.

I presume he refers to my call for an independent inquiry into the "justification" for nuclear power. "Justification" is the process of assessment of the health effects of nuclear power and is a legal requirement before any new nuclear plant can operate in the UK. One of the means by which it can be carried out is through a public inquiry.

The purpose of my call was precisely so that scientific evidence could be examined in the open, and that nuclear scientists, other experts and the public can participate in the decision-making process for new nuclear power in a meaningful way. This call was supported by roughly 80 leading research academics and nuclear scientists in the UK.

If Lynas is so convinced that the health detriments of nuclear are simply an urban myth as he claims, he too should have no problem with a public inquiry. He may however also know that the nuclear power lobby is worried that since the publication of the KiKK study by the German government in 2008 "justification" may not survive more detailed scrutiny.

The KiKK study found that there was a doubling of the incidence of childhood leukaemia within five kilometres of every single German nuclear power station. The study is considered to be one of the best and most complete scientific examinations carried out into the effects of nuclear reactors on public health. It clearly passes the plausibility test.

Perplexing preference

The Lynas article also makes the alarmist and unfounded claim that if Liberal Democrats are in government and nuclear power is dropped, the lights will go out. This is not just a difference of opinion; it is objectively untrue. With the best will in the world there will not be a new nuclear power station built in this country within seven years.

The power stations coming offline over the next decade meant that we need new power generation to come online to replace them before that. With the huge capital costs of nuclear (current estimates are that each reactor will cost not less than £5bn), and the investment this would take away from other sources, nuclear power could actually hinder our chances of bringing the necessary new sources of energy online.

Lynas commends Conservative energy policy and criticises Labour for dragging its feet. I find this perplexing. Lynas has been involved in and written about energy issues for many years now. He therefore must know that in 2006 David Cameron was criticising Labour's commitment to nuclear power as irresponsible. He must also know that as recently as six months ago Zac Goldsmith was saying that no new nuclear power stations would be built under a Tory administration.

If the industry is looking for political stability, it would do a lot better than to look to the Conservative Party.

Need for action

I could go on. I could talk about Lynas's use of the somewhat distasteful phrase "closer to normal mortality rates" to describe the many cancer victims recorded in the vicinity of Chernobyl, or the huge economic and safety concerns surrounding nuclear waste, or the fact that nuclear power is the least cost-effective way of reducing carbon emissions.

But the real problem with his article is that polemics of this kind are exactly what has eroded public confidence in the need to combat climate change. I and others who are fully convinced of the necessity of action on climate change need to get out and about more, engage with the public and make the case.

We need to demonstrate that the decisions that we make are based on the strongest possible evidence and foundations of scientific inquiry. We are not helped by people like Lynas, who claim to be the guardians of "science" while making personal attacks on anyone who dares to disagree. In the end, the only people they discredit are themselves.

Simon Hughes is the MP for North Southwark and Bermondsey. He is the Liberal Democrat shadow secretary of state for energy and climate change

UPDATE: Read Mark Lynas's response to Simon Hughes's article here.