Keith the Apocalypse Bringer is a three-year-old Anglo-Nubian goat in a field in Devon. Keith should not be underestimated. Keith has been systematically dismantling the ecosystem since approximately 7am, when he ate a bramble. This is significant because bramble is an invasive scrub species that outcompetes wildflowers, reduces biodiversity, and creates dense monoculture thicket that nothing else can use. Keith ate it. Keith does this every day. Keith does not charge for this service. 8:15am - Keith ate a thistle. Thistles are also considered invasive scrub in managed pasture. Goldfinches eat thistle seeds, but Keith's grazing will ensure the pasture remains open enough for the ground-nesting birds that can't use dense scrub. Keith has not attended a conservation workshop. Keith arrived at this conclusion by being a goat. 9:00am - Keith dismantled a section of hedge. This was less helpful. Keith does not have a perfect record. 10:30am - Keith escaped the field. He was in the road for eleven minutes. He ate a neighbour's rose. This is not being counted in Keith's environmental impact assessment. 11:00am - Keith was returned to the field. Keith regarded the farmer with the specific expression of an animal that does not recognise the concept of property. 12:00pm - Keith ate more bramble. His digestive system: four stomachs, a rumen full of specialised microorganisms, the ability to extract nutrition from lignified plant matter that would defeat any other animal on this field, is converting scrub vegetation into milk with a fat content of approximately 4.5%. The milk will become cheese. The cheese will be sold at the farm shop. The farm shop is four miles away. The cheese food miles are: four. 3:00pm - Keith produced manure. The manure will grow the grass. The grass will grow the bramble. The bramble will be eaten by Keith. This system has no inputs. It has been running since goats were domesticated approximately ten thousand years ago. Keith is not aware he is saving the planet. Keith is thinking about whether the fence on the north side has a weak point. It does. Keith found it at 4:45pm. Keith got out again.