A FACTORY adds 50% to the SHIELD production of the city.
With a POWER PLANT, HYDRO PLANT or NUCLEAR PLANT it adds 100% instead.
Requires INDUSTRIALIZATION. Needs COAL: +50% shields without.
Industry breeds POLLUTION. Expect smoke on your tiles, and plan for a MASS TRANSIT or RECYCLING CENTER.
The HOOVER DAM powers every factory on its continent.