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Halcyon's 52:52:52 campaign on this site and on Twitter will start in mid 2020. It will help you address 52 issues with 52 responses over 52 weeks.

A Mundane Comedy is Halcyon's new book. Extracts are appearing on this site and on selected social media during mid 2020. Please get in touch with any questions about the book or related Halcyon services.

Part consultancy, part thinktank, part social enterprise, Halcyon helps you prepare for and respond to personal, organisational and societal change.

CO2 levels in the atmosphere

"The MLO" is the Mauna Loa Observatory in Hawaii, USA. This is the famous but remote station where scientists have been measuring CO2 in the air for the longest time. Data at Mauna Loa produced the iconic Keeling Curve. The pioneering work of Charles David Keeling provided key, new insights about how the earth system works.

Atmospheric CO2

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