At least 50 per cent of global electricity supplies will need to come from renewable energy sources by the middle of the century if mankind is to avert the most serious effects of climate change,according to a new report1 by the International Energy Agency(lEA)."Only a limited set of countries have implemented effective support policies for re-newables and there is a large potential for improvement,"IEA executive director Nobuo Tanaka said when presenting the report.
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