1) The passage describes a once idyllic natural landscape that has been overcome by a strange blight, with abundant flora and fauna giving way to unexplained deaths and an unnatural stillness.
2) It references the appearance of a mysterious and poisonous chemical that is slowly destroying the ecosystem, though it does not name the chemical directly.
3) The tragedy is hinted to be self-inflicted by humans, though the full explanation is not yet provided, leaving the causes unclear but ominous.