1.   The chemicals have turned up in the body tissues of whales and dolphins, showing that they may be polluting the oceans.

2.   Boycotts began of Shell products around the world, with environmentalists and some European governments fearing that sinking the platform would pollute the ocean.

3.   Hayes acknowledged that using the streets as a toilet is a problem, saying it breeds disease and pollutes the ocean when raw sewage is washed down storm drains.

4.   Opponents feared that sinking the North Sea platform would pollute the ocean with chemicals and other pollutants.

5.   Sinking them could pollute the oceans with oil and hazardous waste.

6.   The company backed down after Greenpeace protesters boarded the platform and complained it would pollute the ocean, leading to boycotts of Shell products around Europe.