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All IPCC definitions taken from Climate Change 2007: The Physical Science Basis. Working Group I Contribution to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Annex I, Glossary, pp. 941-954. Cambridge University Press.

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Non sequitur logical fallacy

This cartoon was first published in The Conversation. Here are some selected excerpts from the article, to add some context to the cartoon:

Global warming is increasing the risk of heatwaves. This isn’t a hypothetical abstraction that our grandchildren may experience in the distant future. Heatwaves are currently getting hotter, they’re lasting longer and they’re happening more often. This is happening right now.

Globally, heatwaves are happening five times more often than in the absence of human-caused global warming. This means that there is an 80% chance that any monthly heat record is due to global warming.

This is the point at which some people’s logic tends to go off the rails, distorting the science and insidiously distracting us from the risks. The reasoning is that as heatwaves have happened throughout Australia’s history, it follows that current heatwaves must also be entirely natural. This is a myth.

This is the classic logical fallacy of non sequitur – Latin for “it does not follow”. It’s equivalent to arguing that as humans died of cancer long before cigarettes were invented, it therefore follows that smoking does not cause cancer.


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