LONDON, Oct. 6 -- With its new Oli concept car, Citroen has taken a radical responsible approach, using light, recycled and recyclable materials, starting with cardboard. And the weight savings are immediately evident.

Like the Ami, this concept car offers both responsible and versatile mobility. This small urban SUV has been designed with the aim of reducing its weight as much as possible, by using light, recyclable materials for improved durability.

In partnership with the German chemical group BASF, Citroen decided to use recycled corrugated cardboard to form a honeycomb sandwich structure placed between fiberglass reinforcement panels. The resulting material is rigid enough for an adult to stand on. Plus, the weight saving is signif...