> There's no one I can call to get help with my own yard because every landscaper knows nothing about ecology and uses loud and polluting gas-powered machinery.

For my own yard, in Washington State, I've interacted with a half dozen arborists and landscapers. Every one of them has been an expert in local species, has had concrete suggestions about what to plant and how to maintain, and is generally very excited to engage on the problem at the homeowner level.