Scientists in the Arctic region of Norway have warned that polar bears are at risk because of high levels of chemical pollution from the rest of Europe and the Far East.

They've found seven female polar bear cubs with both female and developing male sexual organs, and say industrial chemicals such as PCBs are almost certainly to blame.

PCBs were banned by most countries in the 1980s, but their environmental effect can last for decades.

Scientists say they're also dangerous for humans.

Many experts blame them for a sharp decline in human male fertility in a number of European countries.

European environment ministers are to meet in Portugal tomorrow (Wednesday) to discuss ways of cleaning up the North Sea and the north-east Atlantic.