Drilling
Cities specialized in Petroleum extract and process oil for profit.
- Natural resources such as ore, coal and oil in a region are finite.
- Make sure to inspect the region to find where the oil deposits are before you claim your city.
Petroleum extracted from the ground can be processed into more valuable resources.
- A refinery can be built to convert petroleum into fuel and plastic.
Petroleum is one of the big business specializations. It has it own global leaderboard.