America's most iconic river sustains more than forty million people in the West but as populations boom and the waters recede, are we doing enough to make sure it will continue to flow?

Can this magical kingdom of Bhutan, the happiest place on earth, stay blissfully content as the modern world begins to encroach its remote borders?

The stunning wildlife of Africa is under threat like never before, Weir goes on safari to meet the naturalists battling to save our most precious creatures from extinction.

Bill Weir makes his way to the Andes, deep in the jungle, to find out if the treasures of the Incas can still be saved and learn about the sensitive ecosystem of the rainforest.

Bill Weir travels to Amsterdam, famed as one of the world's most liberal cities, to find out if this bastion of tolerance can stay that way amid a rising tide of intolerance.

What's the best way to protect paradise? In stunning Patagonia, an American conservationist has purchased vast tracts of land to the fury of local developers.

As deforestation rages and unique species vanish, the fight is on 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.

Conservationists turn killers in this battle to turn back time by eradicating mammal invaders threatening the islands' unique ecosystem.

The breathtaking Incan ruins of Machu Picchu are attracting visitors in record numbers but can their fragile beauty be protected in the modern world?