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The climate of the Sahara was completely different thousands of years ago. Rock art from the region reveals a climate that was wet and covered with plants. Scientists have collected data that supports the notion that the ancient climate of the area enabled animals and humans to live in the middle of the Sahara. Part of the "Eons" series.
(Source: DCMP)
National Geographic Explorer-in-Residence Paul Sereno is usually digging up dinosaur bones. But Sereno was walking through the Sahara in northern Niger when he found a nearly 10,000-year-old human skull. This discovery lead Sereno to imagine the green Sahara that was their home. Segment of video from Wild Chronicles Series.
As shown on the History Channel. Africa's Sahara Desert is the size of the United States, making it the largest desert in the world. It's also the hottest place on the planet. But now the series of geological discoveries has revealed this searing wasteland hides a dramatically different past. Scientists have unearthed the fossils of whales, freshwater shells, and even ancient human settlements. All clues to a story that would alter the course of human evolution and culminate in biggest climate change event of the last 10,000 years.
Focuses on animal life in four extremely inhospitable deserts: the Namib's adaptive elephant, a dromedary roundup in Australia's outback, fish in thermal lakes in Mexico's Chihuahua desert, and the Sahara's Ennedi crocodiles. Survival is an eternal challenge to any life in these places.
National Geographic Explorer Paul Sereno and his team are looking for the complete skeleton of Nigersaurus. They traveled to the Niger hoping to find enough bones to construct a complete replica of the dinosaur from the ground up. They begin their search in the dinosaur graveyard of the Sahara Desert. Segment of video from Wild Chronicles Series.
Sand particles from the Sahara desert have long been known to travel across the Atlantic Ocean and southward to the Amazon rain forest. These accumulations are known as dust carpets, and they form as water molecules adhere to the sand particles. As water and sand adheres to one another, they form droplets that accumulate into clouds. However, the Mongolian desert dust carpets present problems for ecosystems upon which it falls. This program explores the science behind the storms and their impact on global climate.
Host award-winning geoscientist, Richard Alley provides an eye-opening look at some of the world's most important case studies in smart energy. Alley travels to Spain and Morocco where large-scale solar farms and individual photovoltaic panels atop tents in the Sahara are beginning to bring the vast potential of the sun down to Earth. In Brazil, abundant natural resources are transformed into efficient, sustainable biofuel, making Brazil the only nation whose cars could keep running if all gasoline were to vanish. In Denmark, and West Texas, citizens have taken sustainability into their own hands by becoming stakeholders in wind turbines. And in China, he explores multiple sustainable energy technologies, including exclusive footage from GreenGen, the world's most advanced low-carbon emissions power generation plant. Part One Earth: The Operators’ Manual.
Human ancestors in Africa likely had dark skin, which is produced by an abundance of the pigment eumelanin in skin cells. In the high ultraviolet (UV) environment of sub-Saharan Africa, darker skin offers protection from the damaging effects of UV radiation. Dr. Jablonski explains that the variation in skin color that evolved since human ancestors migrated out of Africa can be explained by the tradeoff between protection from UV and the need for some UV absorption for the production of vitamin D.
