Air date: 2017-10-07

Runtime: 60 min

A report on an American conservationist who has purchased vast tracts of land in Patagonia, much to the dismay of local developers.

Air date: 2017-10-14

Runtime: 60 min

A visit to Madagascar where deforestation rages and unique species vanish, and where a fight is brewing to save one of the planet's most special places before it is ruined forever.

Air date: 2017-10-21

Runtime: 60 min

As sea levels rise, the sunken city of Heracleion sounds a stark warning of the growing threat faced by the planet's teeming coastal cities.

Air date: 2017-10-28

Runtime: 60 min

Miners want to drill for billions of dollars worth of copper and gold beneath the pristine wilderness of America's last wild frontier but fishermen say the world's last great salmon run could be jeopardized.

Air date: 2017-11-04

Runtime: 60 min

A look at predatory mammals in New Zealand.

Air date: 2017-11-11

Runtime: 60 min

A look at whether the fragile beauty of the Incan ruins of Machu Picchu can be protected from an ever-growing number of visitors.