How to satisfy the world's growing thirst for energy, while also mitigating the effects of global warming? In a recent report, the International Energy Agency says "radical action" is needed to curb green house gas emissions from energy production and consumption. The IEA says a clean energy future will cost 44 trillion dollars between now and 2050. For more on this forecast, Markus Karlsson talks to Maria Van der Hoeven, the Executive Director of the Paris-based International Energy Agency.

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