Oil Springs

Buildings on oil springs get oil (settlement 1, city 2, metropolis 3; hold at most 4); oil counts as a card on a 7, can be stolen, and can't come from supply trades. Spend 1 oil for 2 of one resource, or 2 oil plus 1 brick, 1 wheat and 1 ore for a metropolis (3 VPs, produces 3, flood-proof). Every 5 oil used brings a disaster after the turn: a 7 floods the coast; another number removes that hex's disc, or 3 oil from the supply if it's an oil spring. Instead you may sequester 1 oil a turn (3 = 1 VP; the leader holds the Champion of the Environment, 1 VP). Win at 12 VPs after your turn; if 5 discs are lost no one wins.