[dogscoff]

Both. Minimum resistance causes a direct drop in happiness and/or reproduction (not sure which) unless the population is on an optimal world.

It's now a major problem for me since my planets have a 20% production penalty because of their low happiness levels. I also have no natural population growth so my homeworld populations are getting lower and lower... I'm going to have to start trading / stealing population from other empires soon.

Unless you have some way of boosting happiness and reproduction artificially, or you plan to continually steal population, I do _not_ recommend setting happines & env resistance to minimum levels.

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"Pinky, are you pondering what I'm pondering?"
"Uh, I think so, Brain, but balancing a family and a career ... oooh, it's all too much for me. "