The trend towards sustainability has never been just a passing fad for DeFries; it has always been a standard practice. Utilizing historic building materials results in significant energy savings and, most importantly, reduced CO2 emissions when compared to new production methods. As an example, when constructing a single-family house with 22 tons of bricks, a historic DeFries brick, achieves a CO2 reduction of 7.5 tons on average, far surpassing the performance of a newly manufactured brick. This savings is officially documented and certified for the homeowner, applicable to every type and color of DeFries bricks. In summary, historic building materials not only impart style and character to a construction project, but also contribute positively to the environment.