 If one does not make the radical proclamation that physical law does not govern the environment, then it is easy to see that whatever law describes the perturber’s behavior, it cannot be the laws of classical mechanics \(if\) the environment is to do the job required of it. A time-reversal noninvariant law, in contrast to the time symmetric laws of classical mechanics, must govern the external perturber. Otherwise we can in principle subject the whole system, environment plus system of interest, to a Loschmidt reversal. The system’s velocities will reverse, as will the velocities of the millions of tiny perturbers. “Miraculously”, as if there were a conspiracy between the reversed system and the millions of “anti-perturbers”, the whole system will return to a time reverse of its original state. What is more, this reversal will be just as likely as the original process if the laws are time reversal invariant. A minimal criterion of adequacy, therefore, is that the random perturbers be time reversal noninvariant. But the laws of classical mechanics are time reversal invariant. Consequently, if this “solution” is to succeed, it must exercise new laws and modify or supplement classical mechanics. (Since the perturbations need to be genuinely random and not merely unpredictable, and since classical mechanics is deterministic, the same sort of argument could be run with indeterminism instead of irreversibility. See Price 2002 for a diagnosis of why people have made this mistake, and also for an argument objecting to interventionism for offering a “redundant” physical mechanism responsible for entropy  increase.)[5]