The WaterProducer-Greenhouse™ is a niche technology suited for tropical small islands having these characteristics:
- Tropical, humid climate
- Natural coolant (saline groundwater with reverse geothermal gradient)
- Coastline within 1 km of the 200 m ocean depth contour
A. C. Falkland (2002) stated: "Tropical islands abound in the major oceans (Pacific, Indian and Atlantic) and smaller adjacent seas. In the Pacific Ocean alone there are over 30,000 small islands most of which are in tropical regions. The number of populated islands is in the order of 1000. Several thousand small islands are found in the Indian Ocean (e.g. about 1,300 islands in the Maldives, of which about 200 are inhabited). There are several thousand small islands in the Caribbean Sea of which about 100 are inhabited. The region of Indonesia, Papua New Guinea, Philippines, Malaysia, Vietnam and south-eastern China comprises many thousands of islands. In Indonesia alone, there are over 17,000 islands, most of them small in size, of which about 6,000 are inhabited…"
Small island developing states (most with tropical climates) have a total population of approximately 350,000,000.