Northwestern University scientists have developed a new carbon-negative building material. As Earth's climate continues to ...

looking at it through a screen made with sand, surrounded by buildings made with concrete. I could let you guess what's in concrete, but I suspect you're already catching onto a theme here.

That strain is not from increasing demand for gold, diamonds, or copper, but for sand, the primary material for construction and hence for economic development. Concrete and glass are made mostly of ...