By [[http://www.flickr.com/photos/didbygraham/4394387409/, didbygraham on flickr]] - CC BY 3.0, [[https://commons.wikimedia.org Wikimedia Commons]]</span>UK supermarket chain Sainsbury's has become the first company in the world to introduce a refrigerated delivery truck cooled by a liquid nitrogen powered engine, which the company says will eliminate all emissions associated with refrigeration.
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Cool technology with a conscience
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