"European leaders have struck a broad climate change pact obliging the EU as a whole to cut greenhouse gases by at least 40% by 2030.
But key aspects of the deal that will form a bargaining position for global climate talks in Paris next year were left vague or voluntary, raising questions as to how the aims would be realised.
As well as the greenhouse gas, two 27% targets were agreed – for renewable energy market share and increase in energy efficiency improvement. The former would be binding only on the EU as a whole. The latter would be optional, although it could be raised to 30% by a review in 2020."
Arthur Neslen reports for the Guardian October 23, 2014.
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Source: Guardian, 10/24/2014