I hope no one "starts acting" who is satisfied with a qualitative definition of sustainability and who does not recognize that sustainability amounts to providing truly renewable energy as determined by balance equations to a population stable at its optimum size until astronomical events intervene. I went to a lot of trouble to spell out exactly what is required. It is just a little discouraging to see people reject the hard answers in favor of goals that are easy to counterfeit or goals that are so vague that it is impossible to know whether they are being achieved or not. Perhaps this forum wants politicians to pretend they are solving the problem without changing anything of importance.
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