Lego wants to solve the world’s plastics problem with a biomaterial that can survive generations of play - "replacing 20 types of conventional plastics used in making its bricks with sustainable materials by 2030 to help curb the company’s total carbon dioxide emissions."

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In March, the Lego Group unveiled the world's tallest Lego wind turbine to celebrate having met its 100% renewable-energy target three years ahead of schedule.

In 2015, Lego set another target: replacing 20 types of conventional plastics used in making its bricks with sustainable materials by 2030 to help curb the company's total carbon dioxide emissions.

Lego attributes just 10% of the carbon dioxide emitted during the lifecycle of Lego bricks to the company's own factories, offices, and stores.

Lego wants the same from any sustainable alternative to the 20 conventional plastics now used in their products.

Substitute materials also must be as durable as current plastics used, such as the incredibly tough, oil-based ABS, and as perfectly interlocking and backwards compatible as every Lego brick made since 1958.

"We want any bio-based material to be capable of being precisely molded, or to mold to just a few microns," says Brooks, "And we want it to be shiny." Brooks pointed to a side-by-side comparison of two green Lego bricks: one a sample made of wheat sugar and the other a traditional plastic.

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