In Madrid, the capital of Spain, a huge structure called the “Air Tree” is currently under construction. It is designed to both affect the surrounding environment and act as a social gathering point for people.

The “Air Tree” will generate its own electricity using solar photo voltaic cells placed on top of it. The solar panels will generate enough electricity to be able to sell the energy to local energy companies.

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The United Arab Emirates, home for around 5 million people, wants to build the world’s first zero-carbon city called Masdar City.

In Masdar City cars will be banned. A light rail system will serve the residents inside the city as well as taking them to nearby cities. Waste water will be reused, all garbage will be recycled and organic food will be locally grown.

The water will be provided through a solar-powered desalination plant. Even though the developers of Masdar City haven’t said any exact percentage they plan to power most of the city by solar power.

Masdar City, which will stretch out 3.5 miles and will have a wall built around the city. The wall is there to diminish the heat carried in from southerly desert winds, but also the noise from the airplanes at the nearby Abu Dhabi International airport.

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