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Simply the Best Documentaries

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The Gatekeepers
Growing Up
Johnson Nixon and Vietnam: Reversal Of Fortune
Dinosaurs Alive
Planet Dinosaur Ultimate Killers
WWII In 3D
What the World is Waiting for - British Indie
Bugs a Rainforest Adventure
Clinton Cash
The Magic of Mushrooms
The Great European Disaster Movie
The Day the Dinosaurs Died
Tales by Light Submerged
Planet Earth II Mountains
Planet Earth II Islands
Pill Poppers
Panorama
Edge Of The Ice
Beware the Slenderman
Playing with Nuclear Fire
Finding Atlantis
Do You See What I See
Restrepo
More Than Human
Walking with Cavemen: Savage Family
Jungles
Stardust
The Fukushima Lights
Unafraid of the Dark
The Universe: 7 Wonders of the Solar System
Ape Genius
Meru
10 Things You Need to Know about the Future
Hermitage Revealed
Kingdom of Plants Life in the Wet Zone
Sharks

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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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