"A little of both." He said, "More the second than the first. The theory here is that there was a petrolium-based virus a while back, maybe five years, the world burned, for a while and nature took back over where it could, but people, being people, have tried to wrangle it back under control again." He handed her a small pack of supplies from a shelf in the shed, "You'll probably want this. We've got about three hours. Pixel's stuff doesn't double the time per layer, just adds about half again as much."