Wood is a resource in They Are Billions.
Wood is produced by the Sawmills while stone and iron are produced by the Quarry. These buildings have a collection radius and can only obtain resources from the cells within that radius. For example, the Sawmill gets wood from surrounding trees. The more trees inside its radius, the more wood it will produce.
- Wood is the most useful resource in the early game. If you don't have a forest nearby, start by seeking out the forests and expanding in that direction. Rangers are the backbone of your early game military and lacking access to wood... Well, that's how you get zombies.