This is interesting: > "Echeverria’s vision for the park is part of a wave of projects that have upended the traditional goal of ecosystem restoration: returni

This is interesting: > "Echeverria’s vision for the park is part of a wave of projects that have upended the traditional goal of ecosystem restoration: returning ecosystems to the state they were in before humans damaged them. Instead of seeking to roll back the clock, Echeverria is creating an artificial wetland that aims to transform the future of the entire Valley region, drawing lessons from both Tenochtitlan and modern Mexico City on how thriving cities can coexist with flourishing ecosystems. " Part of the justification for this approach is the relatively new recognition of the large ecological footprint of pre-European peoples, and their extensive manipulation of the natural environment, e.g. the use of controlled burns in grassland areas, etc. "Pristine" environments were often not-so-pristine, so a new managed system is not any different from an old managed system, although you'd ideally want similar levels of ecological productivity and diversity. Another is that climatic effects are going to be significant, e.g. in the long run the only way to save some species, such as California redwoods, may be to plant new stands in Oregon, Washington and Canada. This would be 'managed ecological migration'.