 Today's lecture is about eco houses and this will be looking at all the different aspects and eco houses is a very wide field so you find a lot when you are researching and some of that is not really very much eco at all but we want to explore this a little bit and so let's see we should look at the whole life cycle what is something that should be normal but very rarely this is actually addressed in a proper way so we will see where can the whole life cycle be well arranged in a way that there is low impact that it's well a house that is integrating into nature rather than disrupting and creating waste dumps that are toxic forever and so this means that we start looking at the site proper site does make a difference then design construction the main part is of course or should be operation of a house because we want houses with a very long useful time otherwise it's not ecologic if you make a lot of effort for building a house then doesn't make sense if it's teared down after 20 or 30 years already and if you move through the cities today you see a lot of demolition of houses that were built 30 40 years back was a big environmental impact with huge amounts of energy materials used now teared down and well new material used after only a few decades this is ridiculous so this is behavior that is crazy and it's also unnecessary also reflecting a lack of regulation in that field because these concrete structures that they could live for hundreds of years so it should be forbidden to tear them down otherwise only if it can be proven that it is necessary for various reasons and necessary can also mean to remove something very ugly so I would accept that