It’s difficult to recycle a gigantic wind turbine. The blades are built to withstand extreme weather, from scorching desert heat to hurricane-like winds, and that means their life almost always ends in a landfill. In Europe alone, about 3,800 blades will be removed every year through at least 2022, according to BloombergNEF, as the oldest turbines reach retirement age.

A Danish startup aims to turn old turbines into a material that can address a different environmental threat: noise pollution.

Read more: A Recycling Plan to Clear Wind Turbine Blades From Graveyards (