Geologist Prof Iain Stewart shows how the continent of Africa was formed from the wreckage of a long lost supercontinent. He discovers clues in its spectacular landmarks, mineral wealth and iconic wildlife, that help piece together the story of Africa's formation. But he also shows how this deep history has left its mark on the modern day Africa and the world.
Professor Iain Stewart uncovers clues hidden within the New York skyline, the anatomy of American alligators and inside Bolivian silver mines, to reconstruct how North and South America were created. We call these two continents the New World, and in a geological sense they are indeed new worlds, torn from the heart of an ancient supercontinent - the Old World of Pangaea.
NOVA follows a team of volcano sleuths as they embark on a worldwide hunt for an elusive volcanic mega-eruption that plunged the medieval earth into a deep freeze. The mystery begins when archaeologists find a hastily dug mass grave of 4,000 men, women, and children in London. At first they assume it's a plague pit from the Black Death, but when they date the bones, they're a century too early. So what killed off these families? The chronicles of that time describe a run of wild weather that devastated crops and spread famine across Europe. NOVA's expert team looks for the signature of a volcanic eruption big enough to have blasted a huge cloud of ash and sulfuric acid into the atmosphere, which chilled the entire planet. From Greenland to Antarctica, the team finds telltale "fingerprints" in ice and soil layers until, finally, they narrow down the culprit to a smoldering crater on a remote Indonesian island. Nearly 750 years ago, this volcano's colossal explosion shot a million tons of rock and ash into the atmosphere. Across the globe, it turned summer into winter. What would happen if another such cataclysm struck again today?
An average guy Jeb Berrier, makes a resolution to stop using plastic bags at the grocery store. Little does he know that this simple decision will change his life completely. He comes to the conclusion that our consumptive use of plastic has finally caught up to us, and looks at what we can do about it.
2010 • Environment
Four and a half billion years ago, the young Earth was a hellish place—a seething chaos of meteorite impacts, volcanoes belching noxious gases, and lightning flashing through a thin, torrid atmosphere. Then, in a process that has puzzled scientists for decades, life emerged. But how? NOVA joins mineralogist Robert Hazen as he journeys around the globe. From an ancient Moroccan market to the Australian Outback, he advances a startling and counterintuitive idea—that the rocks beneath our feet were not only essential to jump-starting life, but that microbial life helped give birth to hundreds of minerals we know and depend on today. It's a theory of the co-evolution of Earth and life that is reshaping the grand-narrative of our planet’s story.
Something weird seems to be happening to our weather - it appears to be getting more extreme. In the past few years we have shivered through two record-breaking cold winters and parts of the country have experienced intense droughts and torrential floods. It is a pattern that appears to be playing out across the globe. Hurricane chasers are recording bigger storms and in Texas, record-breaking rain has been followed by record-breaking drought. Horizon follows the scientists who are trying to understand what's been happening to our weather and investigates if these extremes are a taste of what is to come.
The disaster began during a routine systems test at reactor number four of the Chernobyl plant located near the town of Pripyat, on April 26, 1986. After a power surge, an emergency shutdown was attempted and after a subsequent power spike, there was a reactor vessel rupture and a series of steam explosions. The cascading course of events led to exposing the graphite moderator of the reactor to the air, causing it to catch fire. This sent a plume of highly radioactive fallout into the atmosphere. The fallout from Chernobyl prompted mass evacuations as it drifted over an extensive geographical area, including the western Soviet Union and Europe. Over 350,000 people were resettled from contaminated areas of Belarus, Russia, and the Ukraine. Thirty-one deaths are directly attributed to the accident, and all the deaths were among reactor staff and emergency workers. This is the kind of atmosphere Nelson and Ochota are investigating on Life After: Chernobyl as they attempt to determine how the radiation continues to impact the affected areas. They are allowed to stay for as long as they need to in order to conduct their ground-breaking research, but the duo must also be sure to take the necessary safety precautions. Broadway World noted in their Life After: Chernobyl article that by staying in the area for too long, the radiation exposure could reach dangerously high levels in their bodies, and they must always monitor the radiation levels.
2014 • Environment