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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

A Mundane Comedy is Dominic Kelleher's new book, which will be published in early 2020. We will be publishing extracts on this site and across social media during the last quarter of 2019. Please feel free to contact us with any questions about the book.

Population

What Counts? - Global Population Trends

Demographics

 

 

HOW GLOBAL POPULATIONS REACHED ITS CURRENT LEVEL

It took 200,000 years for our human population to reach 1 billion—and only 200 years to reach 7 billion. But growth has begun slowing, as women have fewer babies on average. When will our global population peak? And how can we minimize our impact on Earth’s resources, even as we approach 11 billion?

 

POPULATION GROWTH IS NOW DECLINING