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. In 1913 Frank Shuman constructed a solar powered irrigation plant in Egypt, with a view to transforming Sahara to arable land. At the 1878 World's Fair Augustin Mouchot won a gold medal for his solar power concentrator. Tyson then notes that humans have discovered means of harvesting solar power. 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 thawing-out of the permafrost to increase carbon dioxide levels.Īs early as 1896 Svante Arrhenius published a scientific paper regarding Man's emission of carbon dioxide, followed by Edward Olson Hulburt in the 1930s and Guy Callendar. 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. 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.
#COSMOS A SPACETIME ODYSSEY UNAFRAID OF THE DARK SERIES#
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. This episode explores the nature of the greenhouse effect and the evidence demonstrating the existence of global warming from humanity's influence. The increase in surface temperatures on Earth due to global warming Wells' novel published in 1914, The World Set Free, where Wells predicts that humanity will develop destructive nuclear weapons, perpetuating a devastating global war and forcing the world to come to its senses to create a peaceful society that harnesses the power of atomic energy.
The episode also examines the planet Venus to inspect the runaway greenhouse effect. The episode explores global warming, humanity's effect on the Earth's atmosphere, and what we can do to mitigate it, including a look at alternative energy technologies. The episode was written by Ann Druyan and Steven Soter, and directed by Brannon Braga.
It premiered on June 1, 2014, on Fox, and aired on June 2, 2014, on National Geographic Channel. " The World Set Free" is the twelfth episode of the American documentary television series Cosmos: A Spacetime Odyssey. On June 9th, it will also air on National Geographic (USA and Canada) with bonus content during the commercial breaks.Episode of Cosmos: A Spacetime Odyssey " The World Set Free" If you have any questions about the science you see in tonight's episode, r/AskScience will have a thread where you can ask their panelists anything about its science! Along with r/AskScience, r/Space, r/Television, and r/Astronomy have their own threads. It savors the fact that even bigger mysteries, mysteries like dark energy, await us. This awareness is the humility that distinguishes science from other human activities. All those billions of galaxies, all those stars, planets and moons-they amount to a meager 4 per cent of what really awaits out there. We know less now about the universe than educated Europeans did before the discovery of the Americas. Episode 13: "Unafraid of the Dark" - June 8 on Fox / June 9 on NatGeo US