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It is purely a question of having the right technology. There is no law that says that you can not engineer a polar bear that is not purely carnivorous, is capable of living in warm climate and very useful to humans in some way. Same goes about every other species.

And it is not that sad. Well designed ecologies can be diverse and beautiful. Even more diverse and beautiful than naturally evolved once.

[citation needed]

Well, I can't source precisely that phrasing. But imagine an engineered ecology that is: less cruel than a naturally evolved one; as diverse; also includes some 'dinosaur-killer-sized' asteroid impact aversion system that prevents global scale mass extinctions. Wouldn't you find that ecology more beautiful than a naturally evolved one (that we have now)?

Given humanity's track record, my imagined idea of an engineered ecology is not so rosy as yours. Who would do it, and what would their motivations be?

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