My solution would be to
1) Dramatically increase the hammers cost of building a nuke, so that its far more like a massive project to do so. I'm thinking ~2000 hammers so even you best production city would take 20 turns to build one.
2) Increase the Uranium cost, say to 5. This would make it much harder to obtain the resources required and similarly prevent them from being mass built.
3) Nukes can only be used at the end of a long war. You shouldn't be able to simply declare war and nuke an opponent straight away. As in WWII, they're to end a long fought struggle... implemented this might be that nukes can only be fired if a war has lasted more than 30 turns.
With these rules I'd even consider making the nuke a bit more powerful to be worth the effort, as the damage they cause never seems too much. One city weakened... still not gonna hurt my science victory too much really!
1) Dramatically increase the hammers cost of building a nuke, so that its far more like a massive project to do so. I'm thinking ~2000 hammers so even you best production city would take 20 turns to build one.
2) Increase the Uranium cost, say to 5. This would make it much harder to obtain the resources required and similarly prevent them from being mass built.
3) Nukes can only be used at the end of a long war. You shouldn't be able to simply declare war and nuke an opponent straight away. As in WWII, they're to end a long fought struggle... implemented this might be that nukes can only be fired if a war has lasted more than 30 turns.
With these rules I'd even consider making the nuke a bit more powerful to be worth the effort, as the damage they cause never seems too much. One city weakened... still not gonna hurt my science victory too much really!