There's a guy in New Zealand I met who spent the last 30 years rewilding what was previously agriculture herding land. He said his biggest frustration with land owners wasn't the push back on what he was doing, but the ignorance as to what could be achieved. Every single person he spoke to told him explicitely if the land was left to go to nature, it would be nothing but gorse and it was a waste of good grazing land. The actual result was a return of native rain forest with levels of species diversity that were almost 60% of untouched rainforest, which is pretty incredibly in such a short amount of time.

This is the guy for context - it's a very interesting video that really highlights the impact that over-grazing has: https://www.youtube.com/watch?v=3VZSJKbzyMc