Sustainable Living

What does sustainable living mean in the real world?  I have noticed many people talk about living sustainably and often pepper their conversations with the words 'eco friendly', yet seem to build huge homes with lots of rooms when there are only two, three or four people living in them.  When it comes down to to it these houses are monuments to how much money they have rather than the 'eco friendly' home they say they are and while some ecologically sound principles are used in the construction, how these people live in the long term is critical to how sustainable these houses truly are!  See Truly Green for the real story.