Two-thirds of greenhouse gas emissions come from the energy sector and the lack of change should "serve as a wake-up call", the IEA's executive director Maria van der Hoeven told a Clean Energy Ministerial meeting in New Delhi.

She warned that with increases in wind and solar energy being offset by increased coal use in countries such as China and India, the world needed to act fast "to avoid a potentially catastrophic warming of the planet".

"Despite much talk by world leaders and despite a boom in renewable energy over the last decade, the average unit of energy produced today is basically as dirty as it was 20 years ago," Van der Hoeven said.

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