Solar Decathlon

The video covers the Energy Department's 4th Solar Decathlon, a competition for university teams to design solar-powered, self-sustaining homes. It highlights the competition's requirements, judging criteria, and innovative designs from teams like Germany and Spain. The event emphasizes zero-energy homes and smart solar technologies, with Team Germany winning the overall award. The video concludes with a hopeful outlook for sustainable housing.

What is the significance of a house being a '0 energy home' in the context of the Solar Decathlon?

Describe the passive heating system mentioned in the text. How does it work?