What do you mean by "fixing that". Increasing even more emission limits? We are already going down a serious climate change path, so let's contribute even more on that front?
If more people could live in the cities they would not need cars. Seriously, cars are the biggest problem in the NL. Not emissions from farming or construction.
Emissions from cow farming are a big problem. Even if you don't think it's worse than car pollution (which I'd argue it is, by a long way), the solutions are not mutually exclusive, I think we can agree on that.
As for more people being able to live in cities, those who live outside them do so out of choice. You couldn't pay me enough to live in a place like the Hague or Amsterdam. They're fine places, just not for everyone. And there's the real issue: The Netherlands is full, not because it's not possible for it to grow further, but because it's not possible without reducing the quality of life.
This idea of growth being beyond reproach is thankfully not present in the Netherlands.
Fixing it here would mean acknowledging that you cannot run an entire continent of different peoples, languages and cultures (which affect priorities, such as climate be economy) using one central entity.