I think nature possesses intrinsic value, whether said nature is sentient or not. Plants, for example, have well-beings that can be harmed or benefitted; they have certain needs in order to survive, do well, and even flourish. Therefore, if we were to destroy all of these organisms, for no apparent reason, then I believe value would be lost. Someone could conversely argue that such organisms are not conscious, and therefore do not have an inherent value. Since plants do not possess intrinsic value, then destroying them would not result in a loss of value. However, humans value material things like paintings and cars. We put prices on these objects and believe that ruining or destroying them completely would undermine their value. Such objects are not conscious either.