In this segment, we learn about the role weather plays in the creation of rock formations in the national parks of the United States.

Prime Minister David Cameron will step down by October after the UK voted to leave the European Union. Mr. Cameron made the announcement in a statement outside Downing Street, in which he said he will attempt to "steady the ship" over the coming weeks and months, but that "fresh leadership" is needed.

A film about the global sustainability work of The Prince's Charities, founded by HRH The Prince of Wales.

All Hands Volunteers is a US-based, non-profit organization that provides hands-on assistance to survivors of natural disasters around the world with maximum impact and minimum bureaucracy. Their mission is to enable volunteers to provide assistance to communities affected by natural disasters.

In June, surviving the ferocious sun and intense heat is a challenge for every living being in the park, and each has developed a special technique to see it through until the next rain.

The saguaro cactus blooms overnight and its flower is visited the next morning by a Gila woodpecker. As the heat of day rises, harvester ants work go about their work, wary of a mortal enemy in the park.

May sees drought conditions in the park, but the saguaro cactus is completely unaffected. A family of ground squirrels is laying low, but a long-nosed snake has caught their scent.

The heat of a scorched riverbed is too much for some animals, but the rare and venomous Gila monster is still active and hunting for prey. Meanwhile, the untiring hummingbird mother will feed her remaining chick until it finally fledges.

Despite the intense heat, a female hummingbird must adapt her diet and work non-stop to feed the young in her nest. The rattlesnakes are breeding, and the victorious male claims its hard-won mate.

Male rattlesnakes “dance” in a show of strength designed to win females. A cholla cactus uses its prickly form of defense and the passing javelina to populate new parts of the desert. Meanwhile, the javelina’s tiny young are threatened by a hungry coyote.

A courageous roadrunner faces off with a venomous rattlesnake. The small amount of precious rainfall that January provides gives the desert a sudden spark of life. Plants grow, flower, and store water, and the tiny Costa’s hummingbird uses the finest materials that nature provides to make a nest for her young.

Arizona’s Saguaro National Park was created to save the iconic and increasingly rare saguaro cactus from extinction. Within the park’s desert scenery, conflicts arise between species and can often resemble an Old West showdown at high noon!

Isaac visits one of America’s most well-loved settings for outdoor adventure, Yosemite National Park, which is famous for its iconic granite peaks, waterfalls, and roaming bears!

Yosemite’s mountain peaks are already capped with snow and a mist rolls through the valleys. The coyote’s mating season begins as winter starts, and the bobcat mother will soon leave her young to fend for themselves.

Yosemite’s trees and animals have adapted to endure the occasional wildfire and the extreme changing of the seasons. In September, marmots prepare their burrows for hibernation and the deer are full of energy as the annual rut approaches.