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Simply the Best Documentaries

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Underwater Universe of the Orda Cave
Dangerous Knowledge: God messenger
Amazing Ocean
That Sugar Film
Biggest Things in Space
From Pole to Pole
Deep Web
Ocean Wonderland 3D
The Mating Game
Boko Haram and Unnatural Selection
Supernovas
Asteroids - Worlds That Never Were
Top Science Stories of 2017
Pill Poppers
A Sky Full of Ghosts
Time
Petra: Lost City of Stone
How Big How Far How Fast
Jerusalem
How to Make Money Selling Drugs
Bitter Lake
Frozen Planet: To the Ends of the Earth
Walking with Cavemen: First Ancestors
Absolute Zero Conquest of Cold
Ocean Deep
Atom: The Illusion of Reality
The Story of India: Ages of Gold
The 21st Century Race for Space
Mighty Amazon
Bigger, Stronger, Faster
Titanic 100 Years
Living with Predators. Conservation
Dinosaurs Giants of Patagonia
Arrival
The Ultimate Wave
Is Gravity An illusion

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Earth: Venus Evil Twin
Earth: Venus Evil Twin 2015

There is a hellish planet in our solar system; covered in thick dense clouds and roasted by colossal temperatures. It will be inevitable that the Earth will someday not only be like Venus, but actually put it to shame. A billion years from now, Earth's oceans will boil off, triggering a runaway greenhouse effect, and the temperature will be so high, its all surface will melt. In the distance future, Earth could be the evil twin of Venus. To understand how our world will be destroyed we need to look at what happened to Venus.

Category:Science  Duration:43:00   Series: How the Universe Works

Heaven and Hell
Heaven and Hell 1980

Sagan discusses comets and asteroids as planetary impactors, giving recent examples of the Tunguska event and a lunar impact described by Canterbury monks in 1178. It moves to a description of the environment of Venus, from the previous fantastic theories of people such as Immanuel Velikovsky to the information gained by the Venera landers and its implications for Earth's greenhouse effect. The Cosmos Update highlights the connection to global warming.

Category:Science  Duration:01:00:00   Series: Cosmos

The World Set Free
The World Set Free 2014

This episode explores the nature of the greenhouse effect (discovered by Joseph Fourier and Svante Arrhenius), and the evidence demonstrating the existence of global warming from humanity's influence. Tyson begins by describing the long-term history of the planet Venus; based on readings from the Venera series of probes to the planet, the planet had once had an ocean and an atmosphere, but due to the release of carbon dioxide from volcanic eruptions, the runaway greenhouse effect on Venus caused the surface temperatures to increase and boiled away the oceans. Tyson then notes the delicate nature of the amount of carbon dioxide in the atmosphere can influence Earth's climate due to the greenhouse effect, and that levels of carbon dioxide have been increasing since the start of the 20th century. Evidence has shown this to be from mankind's consumption of oil, coal, and gas instead of from volcanic eruptions due to the isotopic signature of the carbon dioxide. The increase in carbon dioxide has led to an increase in temperatures, in turn leading to positive feedback loops of the melting polar ice caps and dethawing of the permafrost to increase carbon dioxide levels. Tyson then notes that humans have discovered means of harvesting solar power, such as Augustin Mouchot's solar-driven motor in the 19th century, and Frank Shuman's solar-based steam generator in the 1910's. Tyson points out that in both cases, the economics and ease of using cheap coal and oil caused these inventions to be overlooked at the time. Today, solar and wind-power systems would be able to collect enough solar energy from the sun easily. Tyson then compares the motivation for switching to these cleaner forms of energy to the efforts of the Space race and emphasizes that it is not too late for humanity to correct its course.

Category:Nature  Duration:40:00   Series: Cosmos 2014

 
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