I don't think the "environment" as currently conceptualized is as important as one thinks it is.

I've coined the term "relational determinism" to describe what I believe is much closer to reality than the stupid nature VS nurture debate (which is why I explained that I am not a genetic determinist).

Relational determinism describes the possibility to determine one's success in life (as defined by health, wealth, and social life) based on the quality of the relationships one has with oneself, one's environment, and one's peers.

Simplified, this means that someone with a healthy self-esteem, healthy friendships, relationships, and family environment will succeed better than a smart person with terrible self-esteem and relationships in a crappy environment.

So, it's not so much "environmental" as it is relational. You can live in a great environment but with shitty relationships. That's when genetic determinism seems to fit. But it's only one part of the story.