In between getting an up-close look at Iceland's renewable energy efforts, Zac soaks in a spa with Darin, samples rei...

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

Zac and Darin try out life at a swanky eco-village committed to a small environmental footprint, visit a wildlife ref...

On an island that boasts a notable number of centenarians, Zac rethinks his view on nutrition as he ponders how the l...

Following a crash course in apple growing, Zac and Darin head to Peru to delve into potato cryopreservation, biopirac...

In the devastating wake of Hurricane Maria, Zac explores sustainability in the region, where he meets chef José André...

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

Zac boosts his immune system in the Amazon rainforest before climbing a tree, exploring ayahuasca tourism and watchin...