Sustain a what?

I now realize why it was so hard for me to come up with a definition for sustainability. The word encapsulates many different ways of living sustainably. Some factors that come into play when defining sustainability, which make it hard to incorporate all meanings of sustainability, are personal values, cultural values, religious beliefs, political differences, social classes, etc. These factors play a huge role in forming and molding sustainability into many meanings. Due to these many different views of sustainability, how then do we get everyone on the same page and in the right direction OR is everyone actually on the same track, some are just further along than others? I hope it's the latter but how can we ever really know until we start seeing progression towards a cleaner earth on a large scale? At this point I would like to leave sustainability undefined because I think the meaning changes everyday with every person. We all have our own environment (Uexküll's umwelt) and we all have our own realities. So I guess the thing to do is to make sure that we begin to value others even though they may share completely different values than we do because in the end this is a group effort and for sustainability to be achieved, in any form, we must do our best to strive for the betterment of our ecological and social environment through this illusive idea called sustainability.