These people lack what it takes to lead, no matter how much they cry about globalism and technocracy, the latter just being a materialist form of aristocracy and not what it presents itself as being because politicians already employ the advice of experts when making decisions.
To lead you need to be able to lower yourself to other people's level sometimes. These people appear to do it never.
To lower yourself to their level and get their respect, you need to be somewhat like them. This is why we need nationalism, there is no such thing as a global identity.
Sometimes a leader has to do things no one will like. You see this work out in "backwards" nationalist countries because few people feel like they are being screwed over by a different set of people.
You don't get to pick and choose or imagine what defines a set of people very easily, it happens due to factors largrly outside of our control and people can tell when it's forced or faked.
Globalism is fundamentally incapable of bringing about environmentalist change because no one effected by the economic cuts likes it, if it does happen only an alliance of nationalist states could do it.