Our Impact on Planet Earth

In Mexico, Shane Campbell-Staton explores around a maize vault, a treasure trove of genetic diversity. He joins geneticist Sarah Hearne to unravel the intricate DNA makeup of corn. In a tortilla factory, Shane meets with local Mexican chefs Santiago Muñoz and Daniela Moreno, who are committed to reviving the sacred heritage of maize and preserving cultural traditions through corn.

Step into the world of manicured lawns and desert golf courses. Turf grass is America's most resource-intensive plant, yet one of its least productive crops. Palm Springs' golf courses, beautiful but thirsty artificial oases, have impressive engineering to keep their area lush and green. Shane Campbell-Staton visits Palm Springs and examines the environmental impact of our fixation on lawns.

The Westminster Kennel Club played a vital role in preserving and promoting the rich diversity of dog breeds – resulting directly from the hand of human intervention. Shane Campbell-Staton meets these posh pooches and unlocks the secrets of the canine code. We unravel how genes and selective breeding shape these remarkable creatures, with some mutations linking dogs and humans more than expected.