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Greenovation Island: An Island Made of Recycled Glass Sand

With her "Glass Half Full" initiative, Franziska Trautmann wanted to introduce glass recycling in Louisiana. The original idea of the "Glass Half Full" initiative by Franziska Trautmann has now developed into a major environmental project: the construction of islands on the Louisiana coast from recycled glass sand to restore valuable wetlands.

08/26/2025 — Reading time: 6 min

Aerial view of two planted water islands and a third under construction, connected by a dock.

It started with the idea of introducing glass recycling in Louisiana. Now it has become a unique restoration project with a strong mission: to repair damaged wetlands with recycled glass sand and restore entire coastal areas. 

With her project "Glass Half Full" and the idea of introducing glass recycling for Louisiana, Franziska Trautmann was a One Young World Scholar of the Audi Environmental Foundation and participated in the One Young World Summit in Manchester in 2022. By developing her idea, she found a meaningful use of recycled glass for the restoration of damaged wetlands on the Louisiana coast.  Therefore, the organization Glass Half Full, founded by Franziska, and its nonprofit partner Glassroots collect glass across South-Louisiana through free drop-off programs and residential and commercial pickups. Then the glass is transported to the Glass Half Full facility, where it is pulverized into sand and sorted by size. The appropriate size for the "restoration mix" is then used for coastal restoration projects throughout Louisiana. To carry it out, Glassroots recruits many volunteers to help with the coastal projects and educates the residents of the region about the importance of this coastal landscape.

Three people smiling while working on a dock and in a planted water basin.

The first project is to restore part of the Bayou Bienvenue, an area that was once a thriving wetland and now all that remains are the skeletons of old cypress trees and open water. The wetlands were destroyed mostly due to a transportation channel called “MRGO” or The Mississippi River Gulf Outlet Canal, which allowed salt water into the area, killing the native vegetation. The loss of these wetlands also played a crucial role in the devastation of Hurricane Katrina. The canal was finally closed in 2009. Since then, the salt level in the bayou has returned to its usual level and the area is now ripe for restoration.  

Currently, small islands are being built and planted with native vegetation. In cooperation with the Audi Environmental Foundation, Glass Half Full and Glassroots, another island will be created in Bayou Bienvenue: “Greenovation Island”, inspired by the Audi Environmental Foundation's "Greenovation" projects.

Aerial view of a round planted island in the water with a pier and people working nearby.

The first step in building the islands is to create the boundary, which is made of biodegradable material so that the sediment is kept on the island until the plants can take over. The island is built from a mixture of glass sand and the water of the bayou (in German: stagnant or slow-flowing water), which is pumped into the boundary. The sediment continues to build up until it reaches the right level. Marsh grasses such as bulrush and maiden pipes and native trees such as willow and bald cypress are planted then. The islands are regularly monitored to track the growth and development of the plants. Glass Half Full has already planted marsh grasses on the island and cypress trees will follow in the fall. The sediment construction creates a more favorable habitat for the native trees and plants to thrive, thus providing an opportunity to restore the former wetland.

Large round structure in the water with two people and a pump connected to a long hose.

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