The Sargassum Crisis in Guadeloupe and Its Real Impact on Local Communities and Ecosystems

When we crossed the Atlantic Ocean in 2021, we began encountering more and more sargassum as we approached the Caribbean. By the time we reached Guadeloupe, we witnessed firsthand entire coastlines engulfed by this brown seaweed, with beaches buried beneath thick layers stretching for kilometers.

Sargassum has always existed in the Atlantic and naturally drifted with ocean currents. Sailors have documented it for centuries. But since the early 2010s — and especially after 2015 — its growth has become exponential. Scientists link this phenomenon to warmer ocean temperatures, changing Atlantic circulation patterns, and increasing nutrient pollution flowing into the ocean from major rivers such as the Amazon.

What was once a natural marine ecosystem has become an environmental and human crisis for many Caribbean islands, including Guadeloupe. Once stranded onshore, the algae rapidly decomposes and releases toxic gases such as hydrogen sulfide, causing respiratory problems, headaches, and nausea for local populations. Fisheries, tourism, and coastal ecosystems are also heavily affected, while governments spend millions each year trying to remove the seaweed from beaches.

Behind the postcard image of the Caribbean lies another reality: one shaped by climate imbalance, pollution, and the growing fragility of coastal communities facing a phenomenon that now returns year after year.

Three months of research, a spreadsheet, and a conviction

The question was simple: could sail cargo be commercially viable on the Huelva–Canaries–Africa corridor? Three months later, after hundreds of calls, dozens of pricing models, and a benchmark analysis comparing our GDS1 model against 40-foot container rates across major European ports, we had our answer.

It depends—but mostly, no. Current cargo prices are simply too low for us to be competitive at the scale we were analysing. That said, under the right conditions—right cargo, right route, and sufficient volume—it works. But that scenario would require significant capital investment to build purpose-designed vessels.

Trying to launch with already existing boats proved difficult. Without buyers willing to absorb higher transport costs in exchange for a more sustainable option, adoption was limited. Unfortunately, we are not there yet.