Just near one of the entrance of EXPO there is a big, oval-shaped teather-like building, is Earth, tha sustainability pavilion.
The entire complex is able to sustain itself in every way, covered in solar panels to generate all the electricity it requires
and surrounded by other solar generators that are able to rotate like a sunflower in order to follow the sun as it travels through
the sky, specifically designed to catch water from the rain and store it in an underground tank, it's a little example of a
completly self-sustainable system.