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Check out this story in National Geographic: https://www.nationalgeographic.com/culture/2019/07/how-quiet-guatemala-region-became-migration-epicenter/?cmpid=org=ngp::mc=crm-email::src=ngp::cmp=editorial::add=SunStills_20190818&rid=0458E1F0CC41C368BF4E1232EB186FB8.
In the mountain city of Huehuetenango, Guatemala, people migrate to the U.S.A. to escape crushing poverty. They also foresee mining companies and hydropower developers eliminating their hope for the future, perhaps starting another civil war.
We could build flexible floating fishing reefs on the Pacific coast of Guatemala and El Salvador or the Caribbean coasts of Honduras, Belize, and Mexico creating many more jobs than the number of workers living near each reef. People from Huehuetenango (and other locations) could work on the reefs. Some would send money to family back in Huehuetenango. Some would bring their immediate family and meld into the new community. Unlike migrating to El Norte, the workers could visit home and entertain visitors from home.
The same can be done for African mountain or desert communities that are far from the coast.
We can build about 200,000 20-ha reefs before exceeding the global demand for seafood. The income from each reef should support over 100 workers earning over $10,000/yr (not including health, vacation time, and other benefits). That would be at least 20,000,000 direct jobs.

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Mark commented on Smart Toilet

Dear Clement,
Please consider including urine diverting toilets. Check out why at https://richearthinstitute.org/. My comments on the "Sani-Initiative" entry have more details.
You might also want to coordinate with the other sanitation entries. Ideally, you might all combine and offer a catalog of options.

In answer to an earlier question: How do floating flexible fishing reefs benefit refugees (as opposed to creating conditions that allow coastal people to stay home).

Refugees need a place with jobs and education for their children. That implies permanent functioning towns, even cities, as opposed to "camps". Such towns will need the sustainable food, jobs, and export income that flexible floating fishing reefs provide. Because of the permanent (and expandable) reefs, refugees that need to leave a country could fly to the town from anywhere. They would "have a life" using their skills or acquiring new (reef management) skills in the permanent refugee town. After the war or drought is over, some people will choose to go back to their first home, leaving room for new refugees. Some will choose to stay.

People would prefer to migrate within their own country, or at least a place not too far to get back for visits. That implies the best place to establish permanent refugee towns is in (or next to) countries that have repetitive droughts or long-running civil strife. Coastal towns that rely on new fishing reefs, not on land agriculture (freshwater), can be built such that drought is not an issue. Towns that avoid the civil strife will need to be sufficiently distant from the conflict areas.