The world we know is the product of an infinitesimal period, not only human history but in that of life on Earth. To understand the future as well as the past, we need to look back not only over the last 200,000 years since humans began to change the surface of the Earth, but also the last few million years which saw the evolution of our species.

Sir Crispin Tickell – British diplomat, environmentalist, academic and member of the Board of Directors of the Julie Ann Wrigley Global Institute of Sustainability at ASU – explores the subject of "Big History" in this discussion, hosted by the Spirit of the Senses arts and cultural organization based in Phoenix.