Nationalism - in other words, the dividing of the church into bodies - consisting of such and such a nation, is a novelty, not above three centuries old, although many dear children of God are found dwelling in it.
The planet will survive. Whether we get to be here and enjoy it, or enjoy life as we've known it, is what's questionable.
The people of one county can not be indifferent to the welfare of the people in another county.