The rapidly changing ecosystem in Greenland threatens the habitats of the polar bears and other animals that live there. Meanwhile, California's forests battle increasing numbers wildfires due to rising temperatures.

The world's deserts are lands of extremes that force animals to come up with ingenious ways of coping with hostile conditions, giving rise to the most incredible survival stories on Earth.

Mountains create frozen habitats on every continent on Earth, and each of these high-altitude worlds holds unique challenges for its surprising and remarkable life.

Meet the scientists and people dedicating their lives to understanding what these changes mean, not just for the animals and people who live there, but for the world as a whole.

Humans rely on plants for almost everything, including the air we breathe and the food we eat. Two in five wild plants are threatened with extinction, but people are finding new ways to help them, from projects in Africa to reseed the landscape to the rebuilding of a tropical forest in Brazil, tree by tree.

Meet the scientists and people dedicating their lives to understanding what these changes mean, not just for the animals and people who live there, but for the world as a whole.

At the far tip of South America lies a magical realm that seems frozen in time. Known as 'the end of the world', this is Patagonia. Voyaging from high Andes to coastal fjords, we'll learn that to survive here you have to be as extreme as the country itself - either specialize in one habitat, or be tough enough to live in all.

Meet the scientists and people dedicating their lives to understanding what these changes mean, not just for the animals and people who live there, but for the world as a whole.

Cities are growing at a faster rate than any other habitat on Earth. They may seem an unlikely place for animals to thrive, but they can be a world of surprising opportunity.