tag:news.mongabay.com,2005:/xml/green_construction1 green construction news from mongabay.com 2008-12-29T06:46:48Z tag:news.mongabay.com,2005:Article/2355 2007-09-05T14:30:39Z 2008-12-29T06:46:48Z Big companies push energy efficiency Some of the world's largest companies are pushing green initiatives to improve energy efficiency in office buildings reports the Wall Street Journal. Rhett Butler