__2__ them with greener versions.

　　An enormous amount of energy and resources went into the construction of those houses.And it would take an average of 65 years for the __3__ carbon emissions(排放) from a(an) __4__ energy­efficient(节能) home to make up for the

　　__5__

　　lost by destroying an old one.

　　So in the broadest sense，the greenest home is the one that has already been built.But at the same time，__6__ half of US carbon emissions come from heating，cooling and powering our __7__，offices and other buildings.“You can't deal with climate __8__ without dealing with existing buildings，” says Richard Moe，the president of the National Trust.

　　With some exceptions，the oldest homes tend to be the

　　__9__ energy­efficient.Houses built before 1939 use about 50% more energy per square foot than those built after 2000，mainly due to the tiny cracks and gaps that __10__ over time and let in more outside __11__.

　　__12__，there are a vast number of relatively simple changes that can green older homes，from __13__ ones like Lincoln's Cottage to your own postwar home.And efficiency upgrades (升级) can save more than just the earth；they can help __14__ property owners from rising power __15__.

　　【语篇导读】　为了建造一些环保的房子，因此考虑要拆除一些耗能大的旧房子。但其实拆除本身的消耗也是非常大的。幸运的是，现在有一些相对简单的改变，也可以让房子变得更环保。

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