This is seen as particularly likely if countries within the eurozone, of which the UK is not a part, integrate further.

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Second, inequality within countries, particularly developing countries where markets are shallow and governance is poor, is probably itself contributing to low growth.

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Many countries, particularly within the eurozone, have been cutting back hard on welfare spending in an attempt to reduce debt and balance government books as tax revenues fall because of weak growth.

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"The judges were particularly impressed with their highly effective marketing strategy which has put solar lighting within reach of over a million people in 32 countries with significant potential for further expansion, " the Ashden Awards said in a statement.

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