The Constancy Of Change And The New Catastrophism

  • Date: 01/01/17
  • Nick Eyles and Andrew D. Miall – Department of Earth Sciences, University of Toronto

Honest scientific discourse and debate is often rendered impossible in the face of the ‘new catastrophism.’

In 2010, we published what is now a best-selling (and award-winning) book Canada Rocks-The Geologic Journey aimed at telling the dramatic story for a public audience of how Canada (and North America) has evolved over the last 4 billion years. It was a milestone in our professional and personal lives as we went on many field trips to fill in gaps in our own understanding and in the process stepped well beyond our own areas of expertise. We learned much about this fantastic country and its geology.

What is patently obvious from reviewing Canada’s ancient history is that scientists still do not have an adequate understanding of Earth’s complex systems on which to base sound economic and environmental policy. From the upper reaches of the atmosphere to the depths of the oceans onwards to the deep interior of the planet our knowledge of complex earth systems is still rather rudimentary. Huge areas of our planet are inaccessible and are little known scientifically. There is still also much to learn from reading the rock record of how our planet functioned in the past.

In so many areas, we simply don’t know enough of how our planet functions.

And yet……

Scarcely a day goes past without some group declaring the next global environmental crisis; we seemingly stagger from one widely proclaimed crisis to another each one (so we are told) with the potential to severely curtail or extinguish civilization as we know it. It’s an all too familiar story often told by scientists who cross over into advocacy and often with the scarcely-hidden sub-text that they are the only ones with the messianic foresight to see the problem and create a solution. Much of our science is what we would call ‘crisis-driven’ where funding, politics and the media are all intertwined and inseparable generating a corrupting and highly corrosive influence on the scientific method and its students. If it doesn’t bleed it doesn’t lead is the new yardstick with which to measure the overall significance of research.

Charles Darwin ushered in a new era of thinking where change was expected and necessary. Our species as are all others, is the product of ongoing environmental change and adaption to varying conditions; the constancy of change. In the last 15 years or so however, we have seemingly reverted to a pre-Darwinian mode of a fixed ‘immutable Earth’ where any change beyond some sort of ‘norm’ is seen in some quarters as unnatural, threatening and due to our activities, usually with the proviso of needing ‘to act now to save the planet.’  Honest scientific discourse and debate is often rendered impossible in the face of the ‘new catastrophism.’

Trained as geologists in the knowledge of Earth’s immensely long and complex history we appreciate that environmental change is normal. For example, rivers and coastlines are not static. Those coasts, in particular, that consist of sandy strand-plains and barrier-lagoon systems are continually evolving as sand is moved by the waves and tides. Cyclonic storms (hurricanes), a normal component of the weather in many parts of the world, are particularly likely to cause severe erosion. When recent events such as Hurricanes Katrina and Sandy cause catastrophic damage, and spring storms cause massive flooding in Calgary or down the Mississippi valley, and droughts and wildfires affect large areas of the American SW these events are blamed on a supposed increase in the severity of extreme weather events brought about by climate change. In fact, they just reflect the working of statistical probability and long term climate cyclicity. Such events have happened in the past as part of ongoing changes in climate but affected fewer people. That the costs of weather and climate-related damage today are far greater is not because of an increased frequency of severe weather but the result of humans insisting on congregating and living in places that, while attractive, such as floodplains, mountain sides and beautiful coastlines, are especially vulnerable to natural disasters. Promises of a more ‘stable future’ if we can only prevent climate change are hopelessly misguided and raise unnatural expectations by being willfully ignorant of the natural workings of the planet.

Climate change is the major issue for which more geological input dealing with the history of past climates would contribute to a deeper understanding of the nature of change and what we might expect in the future. The past climate record suggests in fact that for much of the Earth’s surface future cooling is the norm. Without natural climate change Canada would be buried under ice 3 km thick; that is it normal state for most of the last 2.5 million years with 100,000 years-long ice ages alternating with brief, short-lived interglacials such as the present which is close to its end.

It is self-evident to us that the public debate concerning environmental change largely lacks an understanding of natural variability. Since the last Ice Age ended, some 12,000 years ago, Earth has been through several periods lasting hundreds of years and possibly longer when it was either warmer or colder than at present. Several earth scientists have suggested that a study of natural variability over recent geologic time should be completed in order to provide a baseline against which anthropogenic change may be evaluated, but this important history has not been introduced fully into the public debate, and is a long way off. It has to be said that the natural variability of the last few thousand years or hundreds of years or tens of years has formed almost no part in the ongoing discussion of climate change which in some circles assumes that any change since 1940 is largely man-made. This opinion is uninformed by geologic science.

The way forward it strikes us is for more scientific honesty and less politics, less grandstanding. ‘We don’t know’ is an honourable credo for scientists. In this regard, we need more science to be directed to the environment, particularly toward better planning of the world’s communities to make them more resilient in the face of change. […]

Disclaimer: This post is a guest reflection piece and is not intended to represent the Society’s official position on climate change.

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