Ecological rethinking and sustainable building concepts have become important topics in contemporary architecture. The use of renewable resources and the in- tention to build in harmony with nature are characteristic aspects for this devel-opment. Apart from the use of ecological building material, the attention is also drawn to reaching a high degree of independence from fossile energy sources and aiming for a high energy efficiency level. This volume presents about 100 of the most outstanding recent projects on this field. A wide selection of groundbreaking concepts from private residences to pub-lic business buildings is presented through texts, photos and drawings.