The world's population is projected to rise to 10 billion by the end of the century, increasing demand for food, water and natural resources, with questions over how this will affect the environment.
Prof Stephen Emmott told science correspondent Tom Feilden of an "unprecedented planetary emergency" and the need for "radical behaviour change".
The computational scientist has teamed up with the Royal Court Theatre in London to devise a one-man-show which is part-interactive performance and part-lecture on what the planet might look like.
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