In this book we aim tO make our readers bet.ter acquainted with sustainable architecture.All kinds of options are presented,since green architecture is not only a question of having a house built without CO:emissions or one that is completely self-sufficient with respect tO elec.tricity or water consumption.Architecture is considered tO be green when it takes account of a number of different factors during the process of constructing a house and the impact a build.ing will have throughout its life cycle:from the moment it is designed,erected and used un—til it is pulled down at the end of the process.The projects shown in this book demonstrate a large range of sustainable and environmentally friendly resources:from recovering traditional architectura]solutions such as cross ventila.tion or the use of natural light tO new systems of insulation and self-sufficient energy supplies.These ideas and proposals will give our readers a general idea of a type of architecture that is real and in a constant state of development.