Huge Air Tree Structure Produces Its Own Power and Oxygen

In Madrid, Spain they are currently building a huge structure called
an Air Tree or Eco Boulevard de Vallecas. The Tree was created by
Urban Ecosystem to be a social center, and to improve the surrounding
environment. The structure is also completely self-sufficient,
generating all its own power with solar cells. Any surplus energy
is sold to the electrical grid. It also produces oxygen using its
arrays of plants and trees, hence the tree appellation.
The designers say