Empire of the sun: a solar power revolution

No energy source has ever increased as fast as solar photovoltaics. The technology will transform humanity’s energy consumption–even when the sun doesn’t shine. Many people associate champagne with success but wine collectors often shun it. Now global sales are fizzing (10:51). And many chief executives are early birds, not night owls. Does it really pay to be up with the larks (18:32)?

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