Limiting global warming to two degrees Celsius presents the world with an "immense" challenge, the International energy agency (IEA) said on Wednesday in its latest World energy outlook.
"Leaving aside any debate about the political feasibility… it is uncertain whether the scale of the transformation envisaged is even technically achievable," it says. The technology shift required would "certainly be unprecedented in scale and speed" and assumes "broad deployment of technologies that have not yet been proven".
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