The building sector give rise to one fifth of the Swedish greenhouse gas emissions. This sector needs a climate shift to reach the UN Sustainable Development Goals. Local municipalities play an important role in this shift and the City of Gothenburg has therefore initiated an innovation project, Hoppet - the first fossil-free preschool. The purpose is to highlight the climate issue and inspire the industry to develop new fossil-free products and processes as well as promoting existing ones. Hoppet is an initiative leading the way towards a fossil-free society in Gothenburg City, Sweden and the world.

Hoppet will be built with minimal climate impact and no fossil resources, as far as possible. This includes everything from production and transport of materials to energy used in the building.

The fossil content and climate impact of traditionally built preschools have been calculated as a benchmark for Hoppet. More than 70 % of the 250 building products in a traditionally built preschool has a petroleum-based content, eg plastics. The climate impact of the building products in a traditionally built preschool was calculated to about 390 kg CO₂-eq./m² gross area.

The design phase of first Hoppet preschool started in the autumn 2019 and, before materials are chosen, calculations of the actual climate impact are made. Examples of climate calculations and strategies for material selection for Hoppet are presented as well as ongoing and future work for fossil-free construction.

For more than two years, the project has scouted for new innovative materials and old techniques in order to build fossil-free. Finding fossil-free and climate neutral products has been challenging. Product development and innovation are key issues for fossil-free construction, as well as communication and collaboration within the construction industry. Five important strategies for the transition into a fossil-free society have been identified; biobased building products, reused and recycled building products, minimized material usage, fossil-free construction site and a product life cycle perspective.

建筑部门的排放量占瑞典温室气体排放量的五分之一。该部门需要应对气候变化，以实现联合国可持续发展目标。当地市政当局在这一转变中发挥了重要作用，因此，哥德堡市启动了一项创新项目Hoppet，这是第一个无化石的学前班。目的是突出气候问题，并激励行业开发新的无化石产品和工艺并推广现有产品。Hoppet是一项倡议，它引领着瑞典哥德堡市乃至世界走向无化石社会的道路。

Hoppet的建造将尽可能减少对气候的影响，并且尽量避免使用化石资源。这包括从材料的生产和运输到建筑物中使用的能源的所有内容。

传统建筑的幼儿园的化石含量和气候影响已作为Hoppet的基准进行了计算。传统建造的学前班的250种建筑产品中，有70％以上以石油为基础，例如塑料。在传统建造的幼儿园中，建筑产品对气候的影响被计算为总面积约390 kg CO ₂当量/ m ²。

第一所Hoppet学前班的设计阶段始于2019年秋季，在选择材料之前，对实际气候影响进行了计算。介绍了用于Hoppet的气候计算和材料选择策略的示例，以及正在进行的和未来的无化石建筑工作。

两年多来，该项目一直在寻找新的创新材料和旧技术，以实现无化石的建造。寻找不含化石且不受气候影响的产品一直是一项挑战。产品开发和创新是无化石建筑以及建筑行业内部沟通与协作的关键问题。已经确定了向无化石社会过渡的五项重要战略；生物基建筑产品，可重复使用和回收的建筑产品，最小化材料使用，无化石的建筑工地以及产品生命周期的观点。