Why Greenpeace is about to drop boulders into the sea off the Cornish coast
The organisation wants to block off South West Deeps to bottom trawlers to protect its delicate sandbank habitat
Fishing
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Why is the government planning to ban fishing off parts of the British coast?
Five areas, which are home to vulnerable marine wildlife, have been earmarked as pilot sites to become Highly Protected Marine Areas.
Poland investigates 'ecological catastrophe' as dead fish wash up on river banks
Poland has deployed soldiers to help clean up the Oder River, which runs along the border with Germany.