Before people get too excited...

I've examined a number of phds on this topic as a relative outsider to the field and have been pretty unimpressed by the claims of env-psych on green/bluespace. The methods used to unpack confounding by class/wealth are pretty minimal and, although lip service is occasionally paid to this in discussions sections after reviewers require it, nobody in the field seems to take it seriously. The effects are an order of magnitude smaller than those of social class. The real story here is 'don't be poor' rather than 'get outdoors more'.