Season 3

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

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.

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.

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.

A look at predatory mammals in New Zealand.

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