> isolated

The whole thread is about limited and well-defined communities, not the world. What the OP wants is specifically “isolated”.

> like planting some seeds

Spending thirty years planting a 550 hectare forest and restoring wildlife to it is not “planting some seeds”. Please don’t be reductive.

> Real change

https://en.wikipedia.org/wiki/No_true_Scotsman

Change is change. You don’t get to define someone’s life work, which was more meaningful and impactful than most of us will ever achieve, not “real” to fit your narrow definition.