some economist or another had a recent publication showing that it is always beneficial for an individual to maximize external costs, no matter what that cost happens to be. this is in contrast to the normal thinking that external costs can be ignored by an individual (rather than maximized) if the individual is looking to maximumize personal gain. the name escapes me, but it might be worth checking.
if you're interested in ecosystem issues, consider looking up the following keywords:
external costs
life cycle analysis
finite resources
economic valuation of ecology (diversity of species)
hopefully that will give you a good start.
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