Ok, this is a slight tangent.
But when it comes to resource what about this...
In the modern era, overseas trade routes add to global warming.
Better yet, corporations in your civ, that are based overseas generate more income, some unhappiness, but also contribute to global warming. Income because selling resource rights to foreign corps generate money & provides new cheap products for business. However, this is at the expense of your workers, who lose jobs as factories move, and hurts the environment because your society doesn't buy local, and is now hooked on cheap foreign goods.
So overseas trade neutralizes costs, pisses of citizens, increases production, and causes pollution (helps diplomatic ties as well, as a side benefit).
This makes the game more fun because the game is offering more than the standard "bad things will happen, unless you have gold". You must make a strategic choice, when it comes to new companies. For example: You allow japanese automakers into your city, for increased production and a neutral cost (+1 overseas, -1 Inc.) You get +1 unhappiness ("we demand a minimum wage"), and global warming comes that much faster.