Circular Arguments and Speculation masquerading as Science

It is still fashionable – and probably profitable – to connect whatever you are working with to Global Warming.

Artist's impression of mammoths in North America

“The inception of a strong carbon dioxide–greenhouse gas feedback and amplification of orbital forcing at ~2.7 million years ago connected the fate of Northern Hemisphere ice sheets with global ocean temperatures since that time.” So says Timothy Herbert of Brown University in a new paper in Science.

His speculations are less than convincing but no doubt he brings in CO2 forcing either to get funding or to facilitate publication.

Completely circular arguments !!

1. Start by assuming that CO2 induced forcing mechanisms cause global temperature change.

2. Analyse the composition of mud cores from 4 regions in the tropics laid down millions of years ago.

3. Find a temperature “fingerprint” ({delta}18O) in the tropical samples showing an increase of temperature of 1° to 3°C some 2.7 Million years ago. Assume that this is unique and exclusive to temperature.

4.Since the “patterns are similar”  the common mechanism must be via the atmosphere.

5. Voila !! This proves that a forcing mechanism induced by CO2 must have been the common cause of the temperature pattern !!!!!

A so-called science reporter  – a Victoria Gill – at the BBC then proclaims “Ancient climate change ‘link’ to CO2”.

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