You're making the classic Techie mistake: Just because something is technically possible doesn't mean that it will happen. The suggestions you make are valid, but many of them will require advance planning, coordination and investment, perhaps even coercion, and they will be most effective and less disruptive if implemented way before a crisis precipitates. They will also require time. In the meantime, there will be resistance to these reforms; political, economic, social. You can see that now. Not all of this resistance can be blamed on deliberate obstruction by vested interests either, the societal solutions will not be clear, and there will be honest differences of opinion, and many honest mistakes will be made. The social changes necessary to implement technical solutions go much slower than the ability of clever men to design new machines.

We have lived all our lives in a time of rapid social and technological change, so we tend to think that this is the natural state of humanity, but in truth, this period in history is a very recent aberration and as a species we still have not learned how to manage it. We've been lucky so far because we always had plentiful resources available to support the technical innovations we have occasionaly needed to resolve a crisis.

In the past, societies faced with challenges like this generally solved (or failed to solve) them over a period of centuries, often without the participants even being aware of the adjustments occuring slowly all around them. In addition, the majority of people possessed the basic skills and resources necessary to ensure personal survival (95% of the population knew how to grow food). But time flows faster now and people are more specialized and interdependent. The potential crises in energy, forests, potable water, topsoil, population, climate, resources, etc, not to mention their political and economic consequences are all exponential in their development, and their effects may be sudden and unexpected, faster than social systems can react.

I don't think the world will come to an end, it didn't after the Roman Empire collapsed either, but the change, when it comes for us will happen within a lifetime, and there will be a lot of suffering. When it all settles down, the solutions will be obvious, but by then it will be too late.