What would we do without concrete? It’s the most used construction material in the world (Science Daily, 2014). However, producing it generates up to 1/10th of the construction industry’s greenhouse gas emissions. A team from the Massachusetts Institute of Technology spent five years studying concrete in an effort to find a way to reduce emissions. Surprisingly, they discovered that not only could they reduce greenhouse gasses related to concrete production by more than fifty percent simply by lowering the calcium-to-silica ratio from the most widely used standard of 1.7 to a ratio of 1.5, but that the new lowered ratio produced cement that was both mechanically stronger and more fracture-resistant.