Probably looking to use Earth as a penal colony, but decided its just too cruel to dump those poor criminals into this mess. 
Either that or they're doing a case study on how to mess up a planet in one easy lesson. 
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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