Col­lect­ively developed zero energy neigh­bour­hoods and new urb­an con­cepts, such as the Cir­cu­lar City, con­trib­ute to the search for new approaches to sus­tain­ab­il­ity. An area where this can already be seen is Buik­sloter­ham in the north of Ams­ter­dam. Over the IJ from the city centre, Ams­ter­dam-Noord is a thriv­ing dis­trict for innov­at­ive pro­jects. The city is aim­ing to turn the former indus­tri­al area Buik­sloter­ham into a cir­cu­lar and sus­tain­able dis­trict with closed cir­cuits for waste and energy. Many examples of energy-neut­ral build­ings are being real­ised, on private ini­ti­at­ive or in devel­op­ment groups.