How much space do we need to live in?
Futures Forum: How much space do you have to live in: "How family homes have halved in size by over 700-square feet in a century"
Futures Forum: How much space do you have to live in? ... Why not make it one of George Clarke's 'Amazing Spaces'?
Futures Forum: How much space do you have to live in - compared to the Continent? How are we taxing that space in the UK? And are you getting value for money from the estate agents?
However, it might be 'greener' - but also illegal - to live in something really, really small:
Live in a tiny house. Since at least the 1920s, the American dream has been all about home ownership — and the bigger, the better. Bankers loved it and so did government, which subsidized the trend for the rest of the century. Then the system exploded in 2008. Today, people are busy rethinking, and one result is the tiny house movement. Tiny houses are affordable, easy to keep up, and allow for flexible and light living. They’re also illegal in most municipalities, but thankfully they can also be mobile.
Fifty More Ways to Leave Leviathan : The Freeman : Foundation for Economic Education
It's getting big:
Under the Ledge: So, you are thinking of downsizing...to a Tiny House
House to catch the forest / Tezuka Architects | Lakes, House and Small houses
designboom contemporary: tiny houses
tiny houses – small dwellings of every shape and size
16 Excellent Tiny House Resources