Tuvalu citizens offered Aus refuge, page-10

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    The issue is not Tuvalu's land area; its the elevation
    above sea level that is the issue. While its perimeter
    is expanding due to sand drift its low lying areas inland
    is constant (and low) while the ocean level is incrementally
    rising.

    Here is an excerpt from Wikipedia:

    https://hotcopper.com.au/data/attachments/5728/5728095-fe6bcc01f21a65883f0222548d9b73e7.jpg

 
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