Disable city ranged attack notifications for aliens?
I'm trying to focus on harmony, but the game tells me every turn that I can perform a ranged attack on the aliens nearby my city.
Can I somehow tell the game I don't want to attack aliens?
It seems the only way to get rid of them is to build the ultrasonic fence, which will prevent aliens from wandering into bombardment range altogether.
It does not address the problem of unwanted notifications, but it does accomplish what you want.