A move to cap emissions from airline and shipping companies has emerged in talks on the global climate change agreement to be signed in Paris at the end of this year.
The idea of imposing carbon pollution targets on each industry has appeared in the lengthy negotiating text on which representatives from more than 190 countries began working on in Geneva this week.
The measure is being backed by countries in the EU, which fought a bruising battle three years ago to make international airlines flying to and from Europe pay for their carbon pollution.
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