Warning of ‘over-alarmist’ stance on climate risk

Opinion: Ireland could pay a totally disproportionate price in complying with EU emissions policy

‘Most of our current sense that climate change may pose an imminent existential threat derives from climate model projections.’ Photograph: Alan Betson

‘Most of our current sense that climate change may pose an imminent existential threat derives from climate model projections.’ Photograph: Alan Betson

Tue, May 13, 2014, 00:01

This week’s launch of the energy policy Green Paper and the recent publication of the Government’s heads of the Climate Action and Low Carbon Development Bill has brought the issue of climate action to the forefront of public attention.

The essence of the Climate Bill is that it commits Ireland to adhering to EU emissions reduction targets and to any UN targets that may subsequently emerge. In round figures, the EU targets consist of a 20 per cent emissions reduction (relative to 2005 levels) by 2020, a proposed 40 per cent reduction by 2030 and an envisaged 80 per cent to 95 per cent reduction by 2050.

As a food exporting country, with consequently large agricultural emissions by EU standards, Ireland will face a particular challenge in meeting these targets. For both climate change and energy security reasons we must play our part in the moving towards a low-carbon world. However, balance requires that our unique national circumstances also be taken into account. Otherwise, Ireland could pay a totally disproportionate price in complying with EU emissions policy.

The EU targets are to a considerable degree an outcome of the climate change warnings issued by the Intergovernmental Panel on Climate Change (IPCC) in its successive reports dating from 1990, including its recent Fifth Assessment Report, comprising three volumes. Given their influence, it is vital that these reports be completely objective.

I wish to make some observations both on the current IPCC reports and on Ireland’s particular situation in relation to climate action. Some commentators have interpreted the current IPCC reports as indicating that the world is facing a planetary emergency of such immediacy that all conceivable actions on emissions reductions, regardless of cost, must be taken. In fact, the overall IPCC message is much more measured than that.

A close reading of the reports shows, in particular, that there is a considerable difference between the relatively cautious stance of IPCC Working Group I, whose report “Climate Change 2013: The Physical Science Basis” was issued last September and the much more alarmist stance of IPCC Working Group II, whose report “Climate Change 2014: Impacts, Adaptation and Vulnerability” was issued in March. The scientific communities producing these reports overlap only to a limited extent; the participants in the first working group are overwhelmingly physical climate scientists while, for the most part, those involved in the second working group are researchers whose expertise lies not in the basic science of climate change but in its societal implications.

The defining statement of the first working group is: “It is extremely likely that more than half of the observed increase in global average surface temperature from 1951 to 2010 was caused by the anthropogenic increase in greenhouse gas concentrations and other anthropogenic forcings.” The report points out that the atmospheric carbon dioxide concentration has now risen to 40 per cent above preindustrial levels, that the global average temperature has increased by about 0.8 degrees over the past century and that sea level is rising at 3.2mm per year.

Tempering these facts, the report acknowledges recent research indicating that up to 40 per cent of the observed increase in surface temperatures over the latter half of the 20th century may have been due to natural variability in ocean temperatures. It also acknowledges that there has been a slowdown in the rate of global surface temperature increase (termed the “warming hiatus”) over the past fifteen years.

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