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

Halcyon's 52:52:52 campaign on Twitter will help you address 52 issues with 52 responses over 52 weeks.

To be a catalyst is the ambition most appropriate for those who see the world as being in constant change, and who, without thinking that they control it, wish to influence its direction - Theodore Zeldin

Atmosphere

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