The air-conditioning industry is starting to feel the heat, and not just from the scorching temperatures that are being felt around the world. It's getting tougher to squeeze more efficiency from today's cooling technology, offering little relief anytime soon for consumers fuming from summer electric bills. Century-old refrigeration technology is simply nearing its limits in energy efficiency. The focus now is on alternative technology, with potential breakthroughs on the horizon. (source: news.nationalgeographic.com)
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