Kelp grown in the Gowanus Canal is too toxic to eat, so the environmental organization that harvested the crop will experiment with new, climate-friendly uses, including making plant-based concrete.
in seven to eight months. Both farms at maximum capacity could remove about as much nitrogen as 50 bags of garden fertilizer.
Still operating at a local scale, the farm could then sequester more than double the amount of carbon than if the kelp was discarded after harvest. The same toxic heavy metals that kept volunteers from handling the kelp would also be locked away inside the kelp-crete more permanently. “I am anything but a kelp skeptic,” she said. “I am a greenwashing skeptic …There’s not enough critical, serious work done to vouch for these claims they’re making.”“If you really want to say this is ecophilic concrete — is what they’re doing enough or is it just a way that they’re allowing something that isn’t completely true to get funding?” Mahmud said.Daniel Shailer
In the meantime, a sample of RETI’s kelp is undergoing analysis at a National Oceanic and Atmospheric Administration lab in Charleston, South Carolina. A new combination of advanced scans — electron microscopy and X-ray spectroscopy — tested on RETI’s kelp will eventually be used to study the enormous swaths of sargassum seaweed washing ashore and threatening beach ecosystems in the Caribbean, according to NOAA oceanographer Steve Morton.
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