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The scientific data about the state of our planet, presented at the 2012(Rio+20) summit, documented that today's human family lives even lesssustainably than it did in 1992. The data indicate furthermore that theenvironmental impacts from our current economic activities are so large, thatwe are approaching situations where potentially controllable regional problemscan easily lead to uncontrollable global disasters.  Assuming that (1) the majority of the human family, once adequately informed,wants to achieve a "sustainable way of life" and (2) that the "developmenttowards sustainability" roadmap will be based on scientific principles, onemust begin with unambiguous and quantifiable definitions of these goals. Aswill be demonstrated, the well known scientific method to define abstract andcomplex issues by their negation, satisfies these requirements. Following thisnew approach, it also becomes possible to decide if proposed and actualpolicies changes will make our way of life less unsustainable, and thus move uspotentially into the direction of sustainability. Furthermore, if potentiallydangerous tipping points are to be avoided, the transition roadmap must includesome minimal speed requirements. Combining the negation method and the timeevolution of that remaining natural capital in different domains, thetransition speed for a "development towards sustainability" can be quantifiedat local, regional and global scales.  The presented ideas allow us to measure the rate of natural capital depletionand the rate of restoration that will be required if humanity is to avoidreaching a sustainable future by a collapse transition.

Development Towards Sustainability: How to judge past and proposed policies?