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If, AS GREENS suggest, the 21st century becomes the solar century, we will have Ishaq Shahryar to thank. Thirty years ago, as a young emigre from Afghanistan in the US, he virtually invented solar power as a serious energy source. He helped develop it for space satellites, slashed costs a hundredfold and then, in a bid to bring it to the people, he designed the first solar-powered Ferris wheel and brought solar panels to motorway call boxes and billboards. Now events back home lure him. He played a key role in setting up the interim government in Afghanistan late…