South Georgia is a small island in the Atlantic off the coast Argentina. What makes this 170 kilometer long island so unique is what occurs on this island. It is here on South Georgia that colossal icebergs that break off of Antarctica land. It is here that they spend their remaining time to melt. Although this is a rare occurrence, it does have substantial effects on the environment. Doctor Mark Brandon from the Open University has been running tests for some time now to see what these effects actually are. With several of his colleagues, Brandon has found that these gigantic icebergs change the current, density, temperature and even marine life of the ocean. The added fresh water into the ocean which changes the ratio of salt to water, making it more dense. This also changes the current. The icebergs also cool the water, allowing plankton to thrive closer to the island of South Georgia. This added plankton has allowed marine life such as seals and penguins to survive on the island.

http://www.bbc.co.uk/news/science-environment-11913457
http://www.scotford.net/Web%20Pages/Roger_Pics.htm