What is the no agressive variant (Peaceful Variant)?
I assume this is the same as the "Peaceful Variant" from p19 of the rules:


  Remove all Aggression and War cards. You probably also want to remove the Pacts that lose their usefulness when no one can attack.


As the rules proceed to explain, this can be more fun for new players so they don't get crushed quite as badly. Military cards are acquired as normal - they are less useful without war but not totally useless (e.g. there's still Colonization). There is definitely less player interaction in this variant, but still some (e.g. competition for particular cards).