The meteoric rise of renewable energy has consequences for our electricity supply. While coal and gas fired power stations can generate electricity whenever you need it, renewables are intermittent by nature. So we need a backup plan for when the wind stops or the sun goes down.
All over the world, engineers and scientists are racing to solve one key problem; how to safely and efficiently store electricity at a huge scale but at a low cost. The quest is producing some truly remarkable ideas and this episode details three of them.

Marc-André Leclerc climbs alone, far from the limelight. On remote alpine faces, the free-spirited 23-year-old Canadian makes some of the boldest solo ascents in history. Yet, he draws scant attention. With no cameras, no rope, and no margin for error, Leclerc's approach is the essence of solo adventure.
Nomadic and publicity shy, he doesn't own a phone or car, and is reluctant to let a film crew in on his pure vision of climbing. Filmmaker Peter Mortimer sets out to make a film about Leclerc but struggles to keep up with his elusive subject. Then, Leclerc embarks on a historic adventure in Patagonia that will redefine what is possible in solo climbing.

In the second episode, Dreadnoughtus males compete for the right to mate. Lizards are hunted by Velociraptor among a group of sleeping Tarbosaurus. A Mononykus forages for termites and investigates new food options after a brief rainstorm. Several types of dinosaurs congregate around a watering hole in Mongolia.
Above the deserts of North Africa, aerial combat ensues as male Barbaridactylus pterosaurs fight for the attention of females below. A herd of Secernosaurus brave the harsh gypsum dunes in search of nourishment.

Will explore the strategy, deception and feats of engineering plants use to thrive in the changing weather of different seasons. In the face of conditions ranging from ice and snow to raging fires, survival is often a question of perfect timing - particularly when contending with intense competition and surprising predators.
In this episode, David Attenborough travels to Finland to show one of the most extreme examples of seasonal plant life in the Arctic Circle. He also travels to California to see how climate change is affecting giant sequoias. These ancient trees like all other seasonal plants depend on the predictability of the seasons and our current changing climate threatens their survival.

Dive with David Attenborough into a world where a single life can last a thousand years. See things no eye has ever seen, and discover the dramatic, beautiful plant life of Earth. In the first episode, Sir David Attenborough shows how more kinds of plants are crammed together in the tropical rainforests than anywhere else on Earth. The result is astonishing beauty and intense competition - a plant battleground.
New filming techniques allow us to enter the plants’ world and see it from their perspective and on their timescale. From fast-growing trees to flowers that mimic dead animals, this is a journey into a magical world that operates on a different timescale to our own.

The film follows the story of Abu Zubaydah, the first high-value detainee subjected to the CIA's program, of Enhanced Interrogation Techniques (EITs), later identified as torture by those outside the agency. Having never been charged with a crime or allowed to challenge his detention, Zubaydah remains imprisoned at Guantánamo Bay in Kafkaesque limbo, in direct contravention of America’s own ideals of justice and due process.
Twenty years on, The Forever Prisoner reveals the origins of the clandestine operations that led the United States, in the 'War on Terror,' on a path of cruelty, deceit, and self-deception. With first-hand accounts from the two interrogators to question Abu Zubaydah, a shocking interview with the chief architect of EITs, and an interview with Daniel Jones, former Senate Investigator, the film uncovers the incompetent and deceptive practices that the U.S. government followed in order to expedite and legalize EITs in the aftermath of 9/11. As a result, torture as a government policy was authorized by the United States for the first time in history.