Some, however, are useful.
The word sustainability is in danger of becoming a 'garbage term', having widely divergent meanings depending on who's using it. A word with too many meanings tends to lose all meaning - more is surely less in this case.
To some people sustainability sounds stagnant, coming across as dug in - neither growing, nor changing nor adapting. To others sustainability means something entirely different - robustness, durability, constancy of purpose, even adherence to core values. Sustainability can reflect how business treats the environment in general such as through recycling and reducing waste and toxins, or it can specifically refer to reducing greenhouse gases and addressing climate change. To some, sustainability is just staying in business. Others define it more broadly, as a paradigm shift from a focus on short-term measures to an alignment to broader aims.
The problem is, no succinct definition can fit them all, so in that sense all definitions of sustainability are wrong. Yet some are useful. The one I find most useful which incorporates a lot of the above ideas - and does so in seven words: sustainability is an appreciation for systems thinking.
A system is a grouping of components and processes in the service of an aim. If it doesn't have an aim, then it's not a system; if you don't know the aim, then you can't optimize the system. If all the subsystems and sub-processes within a system are not aligned with the aim of the overall system, there will be sub-optimization, decay and the eventual destruction of the system.
In looking at the problem of sustainability, the system in question is the earth's biosphere, and embedded within it is a very powerful subsystem called the global economy. Humanity has been putting the biosphere to work in service of the aim of the global economy for centuries. But we will not achieve industrial sustainability and we will not effectively address problems like climate change until we figure how to turn that inside-out, and learn to align the global economy in service of the aim of the biosphere.
What is the aim of the biosphere? Sustainability, of course.
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