Tag Archives: media

In support of Greta Thunberg

This article of mine appeared in The Irish Times last week. I reprint it here for convenience.

‘What’s your take on Greta Thunberg and her school strike?’, a colleague asked me over lunch a few days ago. ‘Wouldn’t she and her followers be better off staying in school’?

Like most people who have been writing about the problem of climate change for some years, I have nothing but admiration for Greta Thunberg.  It’s hard to believe that it is only a year since the diminutive Swede took to absenting herself from school on Friday afternoons in order to sit on the steps of the Swedish parliament, accompanied only by a handwritten placard demanding governmental action on climate change.

But does she really have science on her side?, asked my lunch companion. ‘Or is she some sort of alarmist?’

There is little question that Thunberg has science on her side. Indeed, her demand is not that anyone should listen to her but that they should listen to the climate scientists. It is telling that she began her recent address to the United Nations (an intimidating undertaking for any 16 year-old) by stating that she should not be there. Instead of submitting a written script to accompany her speech, she submitted a chapter of the most recent IPCC report.

But how did her solitary protest become such a big movement?’, my colleague asks. ‘It’s obvious that the movement has been hijacked by the usual collection of eco-loons, anachists and what have you. Who’s paying for all this?’

The growth of Greta’s solitary school strike into a worldwide movement is certainly astonishing. Last month, more than a million schoolchildren worldwide marched in protest. However, there is no evidence the movement has been hijacked or financed by anybody. It seems that a great many of Greta’s contemporaries worldwide have grasped her simple point – the chasm between what they learn in school about the effect of greenhouse gases on global climate and the fact that emissions continue to rise year on year.

‘But the emissions of countries like Ireland and Sweden are negligible in comparison with countries like China. It makes no sense for us to suffer cutbacks while they continue to emit.’

We will never make progress if each nation waits for the other to act. Also, it’s not a given that moving from fossil fuels to renewable energy leads to economic hardship. As it happens, China is now making huge investments in renewable energy.

I’ll bet many of those kids get a lift to school everyday in Daddy’s SUV. And if they’re anything like my lot, they probably have 2 showers a day.’

This is quite possibly true. However, you have to live in the world while trying to change it. While individual actions are important, actions at governmental level are vital. For example, we didn’t address the problem of the hole in the ozone layer by using less deodorant – instead we changed the product.

 ‘ Why can’t they have their marches when school is out?’

One reason is that it wouldn’t be a strike! Presumably, it would be much easier for the students (and their parents) to march on Saturdays, but it would also be much less disruptive.  After all, a postman can refuse to deliver post, and a pilot can refuse to refuse a plane. If schoolchildren want to rause awareness of an issue, they have only one weapon available to them.

‘Don’t talk to me of airplanes – the next time I fly, I can expect delays because some lunatic has glued himself to the roof. By the way, I take it you still fly to conferences?’

I attend very few conferences these days and never in the US – but that’s partly due to a lack of funding for fundamental research. In any case, it’s not the schoolkids who have been targeting aviation – that’s Extinction Rebellion.

‘Ah yes, those guys are determined to make life inconvenient. Ivan Yates compared them to the Taliban the other day’ .

Not a great comparison as Extinction Rebellion is a peaceful protest movement, not a terrorist organization that murders civilians. What XR have in common with the school strikers is a concern for the future. According to the scientists, there is no guarantee that global warming will continue at the current gradual pace. Instead, it is very possible that positive feedbacks will cause the warming to accelerate, rendering some nations uninhabitable due to persistent drought and other nations uninhabitable due to rising sea level. Now that would be inconvenient…

Dr Cormac O’Raifeartaigh lectures in physics at Waterford Institute of Technology and is a Visiting Associate Professor at the School of Physics at UCD. He blogs at www.antimatter.ie


Filed under Global warming, Science and society

RTE’s Brainstorm; a unique forum for public intellectuals

I have an article today on RTE’s ‘Brainstorm’ webpage, my tribute to Stephen Hawking one year after his death.

"Hawking devoted a great deal of time to science outreach, unusual for a scientist at this level"

I wasn’t aware of the RTE brainstorm initiative until recently, but I must say it is a very interesting and useful resource. According to the mission statement on the website“RTÉ Brainstorm is where the academic and research community will contribute to public debate, reflect on what’s happening in the world around us and communicate fresh thinking on a broad range of issues”.  A partnership between RTE, University College Cork, NUI Galway, University of Limerick, Dublin City University, Ulster University, Maynooth University and the Technological University of Dublin, the idea is to provide an online platform for academics and other specialists to engage in public discussions of interesting ideas and perspectives in user-friendly language.  You can find a very nice description of the initiative in The Irish Times here .

I thoroughly approve of this initiative. Many academics love to complain about the portrayal of their subject (and a lot of other subjects) in the media; this provides a simple and painless method for such people to reach a wide audience. Indeed, I’ve always liked the idea of the public intellectual. Anyone can become a specialist in a given topic; it’s a lot harder to make a meaningful contribution to public debate. Some would say this is precisely the difference between the academic and the public intellectual. Certainly, I enjoy engaging in public discussions of matters close to my area of expertise and I usually learn something new.  That said, a certain humility is an absolute must – it’s easy to forget that detailed knowledge of a subject does not automatically bestow the wisdom of Solomon. Indeed, there is nothing worse than listing to an specialist use their expertise to bully others into submission – it’s all about getting the balance right and listening as well as informing….


Filed under Science and society, Third level

Climate change, The Economist and The Irish Times

The Irish Times have kindly published an article of mine on climate change today. Two apparently contradictory facts have recently emerged that I thought worth discussing in my regular column on the IT science page:

A. The buildup of greenhouse gases in the atmosphere has increased over the last few decades, despite the warnings of climate scientists (this month, the concentration of carbon dioxide in the atmosphere exceeded a value of 400 parts per million for the first time in millions of years).

B. There has been a slight slowing in the rise in average global surface temperatures in the last ten years in comparison with the preceding decade.

Some commentators have sought to reconcile these two facts by suggesting that scientists may have over-estimated our climate’s sensitivity to greenhouse gases. In particular, a recent article in The Economist making this argument has been widely cited. However, the Economist article makes heavy use of a single Norwegian study that has yet to be published (why?) and I don’t know any physicists who agree with the hypothesis , for several reasons:

(i) Climate sensitivity is a complex issue and measurements of global surface temperatures do not tell the whole story: about 90% of global warming is estimated to occur in the oceans

(ii) Heat and temperature are not the same thing: temperature response to heating can be significantly delayed, particularly in the case of large bodies of water

(iii) Sometimes significant heating can occur without any discernible change in temperature, for example when ice melts to water: just such a ‘change of state’ is happening on a massive scale at the poles and will result in inexorably lead to increased sea levels and reduced reflectivity, causing further warming



Images from the Skeptical Science website

Some climate scientists fear that we may be entering a new phase of global warming, where a dangerous amount of heat will be stored in the ecosystem without an appreciable change in temperature at first (known as latent heat). Significant temperature rise will eventually follow, but we can expect climate change skeptics to use this delay to deny the reality of climate change.

You can read my full article on the subject on the Irish Times website

Update and correction

In a follow-up letter to The Irish Times, Tony Carey points out that the figures I gave in the article for the increase in greenhouse gas concentrations are actually those for CO2 only.  He is absolutely right in this, the error crept in at the very last draft of the article, aargh. He is also right to point out that while the concentrations of other GHGs are also rising, the rate of increase has in fact slowed for these gases. Well spotted.

However, this doesn’t really affect the argument I make in my article simply because the CO2 concentration is much larger than that of the other long lived greenhouse gases. Indeed, figures for CO2 are often quoted as a proxy for all longlived greenhouse gases for this reason, although this is not strictly accurate.  The diagram below from NOAA illustrates the dominant effect of CO2 very well (turquoise line). Note that ‘radiative forcing’ relates to the effect of GHGs on climate, involving calaculations I won’t go into here. Note also that climate sensitivity is defined in terms of a doubling of CO2, because of its dominance.



Filed under Global warming