Have you ever heard about the small Danish island called Samsø? It's home to only 4,000 people and stretches over about 103 square kilometers of land…and it's 100% energy self-sufficient! Using a combination of offshore wind power, solar energy and biofuels, Samsø has created a green haven, cutting CO2 emissions by an incredible 140% in just 10 years.

The model has been so successful that Samsø even exports energy to mainland Denmark and acts as a model for other islands that are interested in developing renewable energy. It's become a local attraction, too: around 20,000 people flock there during the summer. So what can the rest of the world learn from Samsø? Is a completely energy efficient life possible in bigger regions with large populations, too?