Ambitious restoration projects hope to save two dying rivers and their wildlife.
Simon travels from Arctic islands of Svalbard to the icy wilderness of Lapland.
Deep in the Amazon, Bruce Parry prepares to take the powerful drug ayahuasca.
From heat labs to firefighting helicopters, we look at how extreme heat impacts the UK.
Derek takes the plunge bog snorkelling and walks with opera singer Beverley Humphreys.
Where two worlds collide and animals battle to survive.
Naturalist Steve Backshall visits uncharted territory in pursuit of new discoveries.
Hope turns to ashes as our animal families face an inferno and fight to survive.