Today we are going to meet some ‘green-builders’ who sometimes go against the flow. From small streams, great rivers are formed. In the Bay of Somme, Thibault has chosen to share his environmental commitment by opening the doors of his house situated in the middle of ponds and basins. The small country of Belize gets its name from one of the three rivers that flow through it. The Blancaneaux eco-lodge uses this readily available and abundant resource in order to operate. For centuries, the Dutch have built construction on water, have used it, and know how to protect themselves against it. The Eva Lanxmeer neighbourhood exemplifies this fruitful existence.