Two vessels collided in the Pearl River Estuary, sending 1000 tons of palm oil spilling into the water.
Bioplastic is meant to be eco-friendly and biodegradable. But on closer inspection, it loses its green sheen. Can packaging made from algae and cooking oil really help fight the plastic scourge?
The Caribbean coast is awash with tons of foul-smelling seaweed, causing problems for the environment and tourism. Could a protective barrier in the sea help? It's one of the solutions being proposed.
Thousands of people have turned out against a plan to build up to 400,000 homes on reclaimed land off the island of Lantau. Critics warn the project is too costly and will destroy the environment.
The EU's biofuel policy was meant to help the climate. Instead it's been linked to loss of rainforest because of its reliance on palm oil. New rules aim to phase out the oil but the problem runs deeper, say experts.
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