The Great Barrier Reef should be put on a list of World Heritage Sites that are in danger due to damage caused by climate change, says UNESCO.<br />'' <br />''The UN's cultural body says the world's biggest coral reef system should be downgraded to the list at a meeting next month. It has urged Australia to take accelerated action on global warming. But, the Australian government said it would strongly oppose the recommendation.<br />'' <br />''The latest row is part of an ongoing dispute between Unesco and the Australian government over the status of the iconic site.<br />'' <br />''<span style="color: #222222;">The reef, stretching for 2,300km off Australia's north-east coast, gained World Heritage ranking in 1981 for its enormous scientific and intrinsic importance.</span><br />