Seldom-seen edge case: the World Congress might bring up the question of tweaking a luxury resource. Civs vote on which resource to tweak, and if it should provide zero amenities, or if multiples per civ should provide extra amenities. So for those 30 turns, you might be able to make use of two citrus to provide an amenity to 8 cities.
scottn
- 71
- 1
- 2