Building with wood reduces CO2 emissions in two ways. Wood is a natural building material. To make it, trees need earth, water, air and sunlight, and as they grow they store CO2, which directly affects climate change. In the processing phase, wood needs much less energy input than bricks, concrete or steel. Building with wood is the most efficient method of avoiding CO2 emissions. Lightweight construction systems such as Kielsteg use up to 50% less material compared to solid materials. So Kielsteg should be understood as a contribution to the discussion about the future of sustainable use of wood. But if we make claims about sustainability, we should be able to back them up. So to support we have decided to voluntarily make the CO2 footprint of Kielsteg transparent for our customers over the whole life cycle of the elements. The accounting of the CO2 indicators was carried out by the IBO Austrian Institute for Healthy and Ecological Building and verified by Bau EPD. At the beginning of April, Kielsteg became the first holder of an EPD for wooden construction materials issued as part of the Austrian EPD programme listed and verified by Bau EPD. EPDs environmental product declarations), are internationally recognized and standardized instruments for certification of buildings. Environmental product declarations for building materials are not mandatory at the moment, but can make an important contribution to climate protection by promoting low-CO2 building. Our Kielsteg EPD is certified according to international and European standards ISO 14025 and EN 15805, and is therefore used by our sales partners in Europe and in other parts of the world as part of their approach to creating buildings with low CO2 footprints.