On Mexico's Caribbean coast the sea is not always blue - it's brown with algae. The seaweed gets washed ashore and as well as ruining vacations, damages the eco-system. One man has found a method of turning it into bricks to build homes with.
Part of the Mesoamerican Reef has just come off the list of endangered UNESCO heritage. In Mexico, mass tourism is to fund a first-of-its-kind insurance plan to restore its reefs after hurricanes. But challenges remain.
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