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I'm asking this because I know of the following two, but I'm not totally sure of the details at the moment (and whether there exist any other):

(It would be nice if answers could include quantitative measures as well.)

  • If your people are VERY unhappy, combat strength of all units is decreased.
  • Units that need a strategic resource get a penalty if you lose access to this resource. (How does this work exactly?)
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up vote 10 down vote accepted

If happiness falls below -10, you get a -33% combat modifier.

If you do not have enough strategic resources (less resources than units that require that resource), all units that need the resource get a -50% combat modifier.

I assume the combat modifiers from social policies apply also to you, if the AI civs have the appropriate social policies, but I never saw that in action. Most of these are also not strictly global, but depend partly on enemy/friendly territory or nearby units. The Total War social policy is global, if the AI researches it it should count against you.

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I should really figure out what "not enough" resources means. (zero, how to go negative, etc.) – Martin Oct 19 '10 at 8:52
You cannot build more units than you have resources, but you can lose a resource by pillaging or losing the city-state ally that supplied the resource. – Mad Scientist Oct 19 '10 at 8:57
your opponent having a social policy is not really a negative combat modifier, it's a positive modifier to their strenght (which, admittedly might look like a negative modifier because of the relative change in strenghts). – DMA57361 Oct 19 '10 at 12:24

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