what has global warming got to do with Great BarrierReefs?Do u know the sites which gives info on this?

Answer 1

A section starting at page 103 of the following pdf gives some information
http://www.greenhouse.gov.au/science/guide/pubs/chapter4.pdf

Answer 2

It's not so much global warming as it is the release of CO2 into our atmosphere. For the most part, it goes into the ocean, creating carbonic acid. Since many organisms can only live within certain pH ranges, even the slightest change in the concentration of carbonic acid in the ocean can cause massive deaths of organisms.

Answer 3

Carbon dioxide, responsible for the green house effect, can react with water to form Carbonic acid in the reversible reaction:

CO2 + H2O <--> H2CO3

The oceans are responsible for acting as a buffer in absorbing the raised carbon dioxide concentrations since the pre-industrial era. This has, however, had a huge consequence upon ocean chemistry: the acidity of the oceans have increased. In terms of the pH scale, this drop in pH-correspondiing with more acid- appears very insignificant at 0.1 units.

Despite this appearing a small change in pH, it will have a major effects on ocean chemistry. Calcium Carbonate, an ionorganic salt dissolved in the ocean, is used by many sea organisms in building their shells and skeletons. The increase in ocean acidity leads to a depletion of this salt, as H+ displace the Ca2+ ions in the salt. With subsequent lower CaCO3 concentrations in the water, marine animals and reef organisms will have weaker shells and skeletons; making them more vunerable to predators, clumsy tourists and storms.

Another effect ocean acidification is leading to, is acidosis. The marine organisms are forced to live in a more acidic environment, and its extracellular fluid and celluar cytoplasm become more acidic as well. This raised acidity, altering the structure of the animals enzymes, affects the animals metabolism.