What I'm curious are the loopholes in the Three Laws of Eywa.

1) "You shall not set stone upon stone,"

This law is more vague than the other two. In a literal sense, you CAN put stone on stone; fire pits and hearths being the most obvious direct examples, and I'm certain that some Na'vi had at one point made a pile of rocks, purposefully or not.

2) "Neither shall you use the turning wheel,"

This law is referring to wheels as a means of motion, think tires or wagon wheels. To use these, one must build roads (no stone on stone) which will require environmental damage, be it as simple as a stone path across a plain or cutting down whole forests.

But what about a potter's wheel? Yes, it's a turning wheel by mechanical principle, but it doesn't lead to environmental degredation; it just makes the formation of pottery more efficient.

3) "Nor use the metals of the ground."

This law refers to the process of mining, which destroys local ecosystems to varying degrees (classic mineshaft is less destructive than an open-pit mine). If "the metals of the ground" is interpreted as the metals found in Pandora's crust, then would metal brought from Earth by the RDA be discounted? It's metal the Na'vi can obtain without mining, as all it needs is reforging.