It's the tragedy of the commons though. If I stop driving my car and go vegan, we won't see any measurable difference in climate change. The only measurable thing that happens is my quality of life going down. If enough people do it and we actually get a benefit I could even see Republicans arguing for more deregulation and balancing out all the sacrifice we made. The only practical solution is collective action. In fact I'd argue that non action of countries should be the number one reason for sanctions and if necessary military force. Our entire future is at risk here.