we're already past the point of no return. individual countries need to start investing in local agriculture and industry that will provide a modern lifestyle / economy even when global trade winds down, and very long term infrastructure improvements that will continue to function even when the climate changes further. paying a 'climate tax' doesn't make any sense at all, unless it's being used directly for that rather than being managed by any kind of international authority.  once the country is set up like that it can use some of the resources it has preserved to pay for international scale projects that can't work if only country is invested in them.
Ireland