We discourage using lots of cement because of its adverse environmental impact. However, there are times when it makes sense. For instance, concrete is very useful for making strong bond beams and water resistance structures in rainy climates. Foamed or lightweight concrete such as aircrete has become very popular lately because its lighter weight reduces labor and improves the insulation value. Bricks and blocks are the defacto international building unit, so I did a search for “aircrete blocks” and found the Forterra company in the UK, who is a major supplier of these green building blocks. Their products are profiled below.