A house made of straw. Wouldn't vermin nest there? "NZZ Format" accompanies a couple who are currently considering how best to realize their dream of owning their own home in the most ecological and sustainable way possible and want to discover the advantages and disadvantages of a straw house. The entrepreneur Bjørn Kierulf has built the first automated straw module factory. With EcoCocon, he wants to bring straw as a building material from the niche to the mass market. South Tyrolean Werner Schönthaler shows that hemp is not just for smoking weed. He produces hemp bricks that not only insulate excellently, but are also completely recyclable. Jasmin Amann is also concerned with the circular economy. The architect of Zirkular is a component hunter - and sees our cities as valuable raw material mines. According to a UN report, the construction and building industry is responsible for 38 percent of global CO2 emissions. Most of a building's greenhouse gas emissions arise before it is actually used - during production and construction. We already know how to do things differently: There is both the know-how and the materials to build in a climate-neutral – or even CO2-negative – way. And so materials that were thought to be dead are experiencing a renaissance: straw, clay, lime and hemp are increasingly being used as alternative building materials alongside wood. The circular economy is also becoming more and more important in the construction industry: urban mining is on trend. The city and its materials are no longer waste, but a resource. An "NZZ Format" about sustainable construction and materials that could revolutionize the construction industry. ► Subscribe to our YouTube channel and activate the bell so you don't miss a video: https://goo.gl/Fy28as ► NZZ Format: Documentaries from the Neue Zürcher Zeitung: every Thursday at 11 p.m. on SRF1. ► NZZ Erklärt: Explanatory videos from the Neue Zürcher Zeitung: / @nzz_erklaert