A couple thoughts:
1. Unfortunately, the individual liberties that humanity has worked so hard to establish over the past 300+ years will have to be reinvented/redefined rather quickly, at least to the extent that "the greater good" is considered. The problem with this of course is that our county is founded on principles of the
individual pursuit of prosperity. questions regarding "how much one is entitled to" are impossible to determine to the extent that everyone will be happy (particularly those who do not see a problem with the status quo.
2. Our entire capitalist system is currently ideologically incompatible with sustainability. Business profits are predicated on the business's ability to
externalize costs, particularly to the commons. Hence, the
tragedy of the commons. Businesses need to completely internalize all costs of production, consumption, and disposal. Remember, there is truly no "away" to throw away to, particularly regarding air and water pollution.
Also, this obsession with "growth" - that is the expansion of the mining of the world - must end. I think one good idea is the implementation of
demurrage instead of interest for all financial applications. This would increase long-term thinking in investments, localize economies via personal accounts, etc. I haven't thought it all the way through, but I think it would be good for a start.
Overall, the problem is that sporadic, personal attempts at making a dent do little to affect the situation. If we are to move toward, let alone
achieve sustainability, we must work in concert with one another in order to build a
critical mass of sustainable lifestyle choices. Walking to the backyard to reap lunch needs to be made as natural-seeming as zipping off to the convenience store in the car... for
all of us, every single day.
The degree to which everyone would need to revisit their expectations for the future will be awesome, and the coordination and leadership needed to pull this planned, coordinated program off will be nothing short of legendary.