As I say, handofdave, we are a million miles from one another. But that's OK. The limb I'm out on is a million miles from just about anywhere.
Let me state my position in a radically over-simplified manner. The numbers I'm using are plucked out of the air, but they are -- I believe -- of roughly the right orders of magnitude...
Western society MUST make the required dramatic changes within the next 3 years (and I'm talking about a radical restructuring of our entire way of life). If we fail to do so, then it will be too late. And within 15-20 years, western civilisation will undergo a complete collapse, including the collapse of most of our food and energy production and distribution systems. This will be accompanied by unprecendented environmental damage. Between a half and three quarters of the entire global population will be decimated by resource wars, famine, drought and disease. Most of the rest will experience extreme suffering.
Oh, and the timescales may not be as generous as I'm suggesting.
You're saying that I'm arguing "best case scenarios". I'm about as far from that as I know how to be. I'm saying we have a choice between extreme disruption and death. And that we must make that choice and implement our decision within 36 months.
Everything else is pissing in the wind.