In this final episode, Dallas examines what it takes to keep seven billion humans alive with food, energy and water.

In this episode, Dallas explores how we can travel further and faster than ever before - and how our desire to shrink the world is inspiring some of the most extraordinary engineering projects on the planet.

Supersized Earth traces the spectacular story of how humans have transformed our world in a generation. In this awe-inspiring three-part series, Dallas Campbell travels the globe, visiting the world's largest and most ambitious engineering projects, exploring the power of human ingenuity.