[anemoiac]

Part of this problem, as I (a non-expert) see it, is that so-called mainstream economists tend to operate within a specific paradigm that imbues a certain perspective toward the subjects of their analysis. Accompanying that perspective are the same sort of limitations you allude to when you point to ecologist as a domain expert (tangent: economists are also domain experts, with all of the limitations that implies, even if some economists seem to imply that virtually everything is economics...). This remains true even among environmental economists, who largely share the approach of their peers in the world of mainstream economics. While the questions you provide are examples of relevant and necessary concerns, and might be easily addressed (at least superficially) in an undergraduate environmental econ. textbook, they also reflect the limitations of the field.

In my opinion, when it comes to ecological concerns, effectively aligning private incentives with the public good is a question for ecological economists * , not just (plain old) economists or ecologists. Ecological economists, though fewer in number and typically relegated to more liminal realms of the field than mainstream economists, utilize a relatively more wholistic approach that carries with it a different set of limitations. If humanity is going to successfully address the monstrous environmental challenges it faces in the 21st century, I suspect it will be accomplished by asking different questions than those (mainstream) environmental economists are prepared to answer.

* as well as other scientists and social scientists (e.g. environmental sociologists)