The soil. Filled with evidence of catastrophes. Uncontestable records of human blunder written across fragments of mutated DNA. Fossilized remains of molecule-sized robots which had been programmed to eat organic molecules and vomit out cancerous grey goo. Food plants, tricked into aborting their own seed embryos, which had cross-pollenated with wild forests and blighted whole continents in the blink of an eye. Poisons; layer upon layer of toxins, saturating the Earth's crust as deep as her roots could penetrate.