> Here in Northern Europe 100% of manure from housed animals is used,

That's the wrong statistics to look it - 100% of waste coffee is used. They already have it, good management will figure out a way to use it.

But you cannot make an argument that we have to keep drinking coffee because fertiliser industry will collapse without waste coffee.

There are thousands of studies about impacts of intensive animal faming on landscape, economy, health and society in general, they are all negative. This was settled like 40 years ago.