Help with Geography...?

Question

I need to know all about the man caused destruction to the Great Barrion Reef. Could you please help?

Answer 1

"Another key threat faced by the Great Barrier Reef is pollution and declining water quality. The rivers of north eastern Australia provide significant pollution of the Reef during tropical flood events with over 90% of this pollution being sourced from farms. Farm run-off is polluted as a result of overgrazing and excessive fertiliser and pesticide use. Due to the range of human uses made of the water catchment area adjacent to the Great Barrier Reef, water quality has declined owing to the sediment and chemical runoff from farming, and to loss of coastal wetlands which are a natural filter. It is thought that the mechanism behind poor water quality affecting the reefs is due to increased light and oxygen competition from algae. ..."

Answer 2

the great barrier reef off the east coast of Australia is the only living structure seen from outer space, i say living structure because it is made up of living corals,

Marcelino, is partly right in what he says about pollution, the biggest threat at moment is the starfish  CROWN OF THORNS it is a predator of the natural coral and is grazing quite savagely on the corals on the reef are a garden of spectacular color and formation, it is the home to thousands of species of tropical and sub tropical fish,

the humpback whales migrate from the southern ocean to the warm waters of the reef to give birth to there young, and return to Antarctica in the southern summer