Have you considered the German UMWELTBANK? They are doing pretty well and sustainability is a growth field. As far as I can remember they were happy with my Irish address, but you need to pay Irish tax on interest. I am not a customer yet but I seriously consider them, as their investment in Green technology makes sense to me. Comments welcome.
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German economy is very depressed also, but no housing bubble and alot of future sustainable industry
Not sure about the Postbank though, they took a bad hit.
Fanny