I see, you're talking not about unilateral personal choices, but unilateral country choices. It's not that simple, there are many unilateral choices a country

I see, you're talking not about unilateral personal choices, but unilateral country choices. It's not that simple, there are many unilateral choices a country can make that would not have a net negative effect. For example if you close a coal power plant in Virginia, China is not simply going to build one and sell the power to the US - there are physical limitations there. You have a valid point that a country needs to think about unintentional consequences of their decisions, something politicians are notoriously bad at, but claiming that all unilateral action is net negative is such a ludicrous strawman that I don't actually beleive that's your position on the subject.