Searching for ways to minimize their carbon footprint, Zac and Darin visit a self-sustaining home and other businesses innovating to reduce waste.

In the aftermath of a devastating bushfire season, Zac and Darin learn about efforts to rehabilitate the wildlife and livestock population.

Zac boosts his immune system in the Amazon rainforest before climbing a tree, exploring ayahuasca tourism and watching his dinner wriggle on a plate.

Leaders and representatives of Aboriginal communities show Zac and Darin how Indigenous cultures live to protect and preserve the land.

After a beekeeping stop on a New York City rooftop, Zac checks out London's pollution-reduction efforts, from wall gardening to trash collecting.

From Sydney to the Greater Blue Mountains, Zac and Darin meet with leading eco-warriors to learn about protected lands and habitat conservation.

Following a crash course in apple growing, Zac and Darin head to Peru to delve into potato cryopreservation, biopiracy and the sport of sandboarding.

Zac and Darin test their cooking skills in Melbourne before heading to the Torres Strait Islands to understand the impact of rising sea levels.

Zac and Darin try out life at a swanky eco-village committed to a small environmental footprint, visit a wildlife refuge and enjoy a zip lining trip.

Before heading to Paris to learn about its tap water system, Zac joins pal Anna Kendrick for a lesson in H20, courtesy of a water sommelier in LA.