The eutrophication of the oceans has become apparent in recent years through toxic algal blooms, oxygen depletion, loss of biodiversity and fish kills. It is estimated that around 80 percent of marine ecosystems are affected by eutrophication. One of the main causes is extensive agriculture. At the same time, global food security is at risk, as more frequent droughts, floods and low water levels are also increasing the pressure on the world's freshwater resources.

 

The Düsseldorf marina has had problems with blue-green algae, fish and bird mortality for years. The Rhine also continues to be heavily polluted and carries its nutrients into the North Sea.

 

To mitigate the effects of global eutrophication of marine ecosystems, we have developed the Zero Garden, a floating hydroponic harbor farm that grows water and climate-neutral tomatoes and lettuce in a harbor.