This is an error.
Environmentalism is a concern for minimizing environmental harm.
It is not at all clear that the State is a better steward of nature than the market. For example, the US government is subsidizing uneconomic resource depletion and pollution via farm price supports and corporate welfare for resource-extraction industries. To take an obvious example, if the government were to privatize the Tongass National Forest in Alaska and stop its below-cost timber sales there, logging in the area would become unprofitable and cease. Private owners have an incentive to maximize the value of their property, an incentive that bureaucrats lack. But if profits come first under a system of common law, people have an incentive to conserve valuable private resources and minimize harmful pollution, which exposes them to liability for trespass or nuisance.