Well the slogan "we can't just trust that technology will save us," encourages people to think we must change our trajectory with regard to social change, but there's no reason to assume changing our trajectory with regard to technological change is any less important.
Agreed, but that's hardly what anybody in this thread believes. I think that social/lifestyle change without technology is doomed to failure, just as hoping for a technological solution without any social change would be.
Also, I do think that as technology has advanced we have become less dependent on ecosystem services. Hunter-gatherers were utterly dependent on a precise balance in nature to get enough to eat. Farmers before irrigation depended on the rain to water their crops. If cheap desalination technology is invented, farmers won't even have to rely on rivers or groundwater any more. Also, since this century has faster technological change than any other century, (due to the hard work of a lot of smart people) we may see our dependance on ecosystems decrease faster than any previous point in history.
That isn't accurate. We rely on the environment in other ways, and the increased complexity of our reliance makes us ultimately more vulnerable to serious disruption.
Hunter-gatherers relied on the ecosystem in the simplest way imaginable, but their population density and the complexity of their society made them very resilient. Farming gave people access to more food, but it increased their reliance on other resources - quality topsoil, benign climate, water, fertilizers, wood, etc. Absence of any of these things could send the whole society crashing down, and the large sedentary population prevented easy relocation. Famine, epidemic diseases, and war became a part of human life. Ergo, technology brought some advantages, some solutions to previous problems, as well as many new problems.
Sticking with farming, today farmers are dependent on even more resources, the crucial one being oil and petroleum products. Without those, large scale mechanized agriculture becomes impossible to maintain, meaning we won't be able to feed our bloated population. Add to that the consequences of climate change, topsoil erosion, pollution buildup, and salination and we're looking at a serious problem with our food supply in a very near future. So how independent are we from the ecosystem, really? We need resources tu survive just as ever, we just need more of them both in terms of type and quantity.