Episode 12 of Fox's Cosmos focuses on the scientific rationale for climate change. The greenhouse effect, which was one of the main scientific endeavors of the original Cosmos host Carl Sagan, is when gas in the atmosphere traps sunlight bouncing off of the Earth's surface. Modern civilization burns fossil fuels which adds more carbon to the air, helping the atmosphere get even warmer. Check out this video below for a visual explanation of the greenhouse effect.

NOTE: If you need captions, please click the CC button on the player to turn them on. This animation uses narration and illustrations to explain the greenhouse effect and how it relates to climate change. It starts by describing the Earth's energy balance and the natural greenhouse effect.

Look below for more video blurbs from Cosmos, as well as the live Storify twitter chat that we held during the show's viewing.

People from all over the world transitioned from nomadic cultures to agricultural ones that used solar energy much more efficiently.

We can read the earth's unbroken record of the atmosphere that extends back over the past 800,000 years.

Every few years or so Mount Etna, Sicily, erupts sending tons of carbon dixoide into the atmosphere. Subscribe now for more COSMOS clips: http://fox.tv/SubscribeFOX See more of Cosmos on our official site: http://fox.tv/Cosmos Follow Cosmos on Facebook: http://fox.tv/Cosmos_FB Like Cosmos on Twitter: http://fox.tv/Cosmos_TW Add Cosmos on Google+: http://fox.tv/Cosmos_Plus Follow Cosmos on Instagram: http://fox.tv/Cosmos_IG Like FOX on Facebook: http://fox.tv/FOXTV_FB Follow FOX on Twitter: http://fox.tv/FOXTV_Twitter Add FOX on Google+: http://fox.tv/FOXPlus Are We The Problem?