Climate Act requires all homes built after 1917 to go zero carbon

Very interesting (and brief) blog post.  It concisely illustrates the magnitude of the challenge of reducing emissions associated with existing housing stock:
 
http://carbonlimited.org/2009/02/02/climate-act-requires-all-homes-built-after-1917-to-go-zero-carbon/
 
Here's the important graph from the blog post:

graph

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