Why is the Great Barrier Reef threatened?

The Great Barrier Reef is the world  biggest coral reef. The reef is outside the coast of Queensland in Australia.

Great Barrier Reef is beeing threatened by tourists who is stepping on the corals. Boats are alos damaging the Reef. Boats who are leaking oil and boats who are dropping their anchor and drag them along The Reef.

I think its sad that the Reef is beeing destroyed by boats and torusim. I think the boats should be denied from driving near the Great Barrier Reef. I also think that it should be people who guides the toruists.

Bibliography:

http://no.wikipedia.org/wiki/Great_Barrier_Reef