The Netherlands has a new bridge for its millions of cyclists, but it wasn't made the traditional way.
It's made of hundreds of layers of concrete along with steel cables. The concrete is only poured where needed, which means less is used than in traditional bridge building.
The steel helps the concrete deal with certain kinds of stress.
That matters because making concrete isn't great for the environment due to one of its ingredients — cement. Cement production accounts for about 5 percent of global carbon dioxide emissions.
Those behind the project say they can take the information learned from making the bridge and apply it to even bigger structures in the future, like houses.