How can AI driven sound shape environments? This work recalls stories of a post-natural world that has been computationally updated, where nature itself has been reprogrammed. It takes the form of an LP record and a multi-channel playback experience in the Len Lye Cinema and was devised by Machine Listening, an artist collective known for exploring the politics of AI, data sets, and networked technology through sound. Environments 12 is an artistic intervention into the histories of ambient soundscape recordings—the sampling of the natural world popularised by the wellness industry. It takes after Irv Teibel, an ambient new age music pioneer and field recordist who founded the ‘Environments Series’, 11 records produced across 1969-79 with titles such as ‘Psychologically Ultimate Seashore,’ ‘Gentle Rain in a Pine Forest,’ and ‘Ultimate Heartbeat’ —marketed as “a stethoscope recording which could be used to calm infants, aid meditation or enhance lovemaking.” Released around the time of the 1979 oil crisis, the series was a response to early signs of climate emergency and yet, each recording was smoothed and edited to auditory perfection so it could be even better than nature. As a speculative 12th edition to the Environments Series, this record could be thought of as an inverted environmental recording. Rather than presenting the ‘sounds of nature’ on their own, it is about these sounds, how they came into being, and how they are being used to reprogram nature itself. Through a chorus of AI clones trained on human voices that embody the unhinged anxiety of climate grief, the narrative recounts tales of an environment-to-come that is all too close. Artificial voices recall artificial environments shaped by sound, a strange future of acoustically enriched ecosystems where the dying Great Barrier Reef is kept on life-support by broadcasting the soundscapes of healthy coral reefs, and cross-species communication between animals and AI is possible, but only without cognition by humans. Responding to past acoustic histories, Environments 12 augurs the ruins of a future history, a post-natural world where nature itself has been upgraded.