The past 20 years has been an exciting time for those concerned with the future of energy. Since 2006, the modern solar cell developed in 1954 has improved in leaps in bounds as photovoltaic technology increased their efficiency. The humble wind turbine is changing, too; this month China’s S2000 high-altitude wind-power airship successfully completed its first test flight, supplying energy to the ground from 2,000 metres up.
Given that it took well over a century from the discovery of electricity in 1800 to establis
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