Are rising temperatures driving Earth's ecosystems past a point of no return? We have promising technologies that put solutions within our grasp. Scientists are exploring solutions: from geoengineering to sucking carbon out of the air to cloud brightening, as means to cool the planet. Cutting-edge solutions and high-risk measures. But would they work? And what are the risks of engineering Earth's climate?

Most planets we know of are so hellish, it seems impossible that anything could live. But it's amazing where life can take hold in the Earth. Astrobiologists look for simple single-celled microbes known as extremophiles in places as Danakil Depression, known in Ethiopia as 'The Gateway to Hell.'
In Episode 2, the fictional world is Janus, a planet in such a close orbit than its rotation is locked by the star's gravity and it always shows the same face to its sun. On one side of the planet, it's always daytime, a searing desert. On the other side, it's forever night, a frozen shadowland. Squeezed between the two, a sliver of perpetual twilight. Freezing meltwater flows from the cold side, carving canyons through the landscape. Deep in these canyons lives an extraordinary five-legged creature.

From Patrick Kennedy's emigration in 1849 to the death of JFK Jr. in 1999, the films charts the family's rise from poor Irish immigrants to an all-powerful dynasty, exploring the lives, careers, personal tragedies and scandals that have given rise to the idea of a Kennedy curse.
Featuring interviews with family members, and including rare archive, photos and letters, 'The Kennedys: A Fatal Ambition' sets the events in historical context, examines the family's unique characteristics and asks what part they may have played in many of the misfortunes.

The episode opens with Ewan McGregor and Charley Boorman riding through the sleek streets of Guanacaste, Costa Rica. To add to the excitement, the show also introduces us to Ewan's daughter, Jamyan, and the father-daughter duo are lovable to watch. The audience also gets a chance to see the Masaya volcano up close. The red lava is breathtaking and scary at the same time.

Ewan and Charley make their way to Peru from Bolivia, and the scenery is just beautiful. Ewan wanted to visit Machu Picchu since he was a kid and decides to show the world the Incan citadel set high in the Andes Mountains. Next up, they make their way to the Cutivireni, a community of Ashaninka people in the Amazon rainforest, with its carbon program to limit the magnitude or rate of global warming and its related effects.

Even 2,000 years after his death, General Hannibal's battle strategies are still studied today. But of all his military feats, perhaps his greatest was leading his massive Carthaginian army of men and three-dozen elephants across the Alps and into the heartland of Rome in 218 B.C. Until now, the route they took has been a matter of dispute, but thanks to modern-day technology, geomorphologist Bill Mahaney and microbiologist Chris Allen believe they've accurately traced this ancient journey.