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"Elon Musk's Powerwall could change the carbon footprint of entire societies"
Opinion: Elon Musk is a real-life Tony Stark – a billionaire CEO who wants to change the world. With the launch of his energy-storing batteries for powering our homes, he may actually be developing the technology to do it, says Dan Hill. More about "Elon Musk's Powerwall could change the carbon footprint of entire societies"