The International Maritime Organisation (IMO) has come to a broad agreement to implement a global 0.5% limit on the sulphur content of fuel from 2020.
The current limit is 3.5%.
The chair at the marine environment protection committee (MEPC) meeting indicated the earlier date rather than the 2025 alternative in a decision to be confirmed on Friday.
The decision was reached after a heated debate at the IMO this afternoon.
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