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Adiamante (edition 1998)
Adiamante by L. E. Modesitt Jr.
Amazon.com Amazon.com Review (ISBN 0812545583, Mass Market Paperback)Earth was once the capital of an interstellar empire, but now it's just another inhabited planet in a forgotten universal order. Its citizens survive through kindness, environmental conservation and non-aggression. But humanity's great strides toward erasing its violent past are threatened when 12 ships made of indestructible adiamante appear in orbit. The ships are from a former colony bent on subjugating the Earth and its inhabitants. But the strict ethics that have helped revitalize the Earth may be its downfall, as the human homeworld struggles to find a way to save itself without violating its new-found principles.
(retrieved from Amazon Thu, 12 Mar 2015 18:10:41 -0400)
After a millennia of exploitation and war, the people of Earth have built a society based on environmental conservation and nonaggression. These priciples are tested when a hostile fleet appears in orbit.
(summary from another edition)
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