Global Systems
- Changing Environments

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Many computer models have been done predicting the future.  They greatly.
Some suggest results are:

  • will not warm as much as the
  • Greatest change will be in the northern parts of the Hemisphere
  • Area of land covered in will
  • Number of and tropical will increase
  • Rainfall will in areas towards the but will in regions (eg Mediterranean and Queensland/NT)

Who will survive?

Some scientists suggest that past climate change has resulted in from the earth.

Belief is that combined with of ecosystems has lead to a reduction in .

Australia is quite a biodiverse country we have

  • Many species are unique to Australia
    • 85% of our mammals
    • 91% of our plants
    • 90% of our and
    • 50% of the population

Great Barrier Reef

Coral is sensitive to in temperature.
above summer average can stress the coral.
(unicellular, photosynthetic organisms) live symbiotically with the oral and provide and
Stressed expels Protists and lose their colour (bleaching).
take over and the coral may not recover.
The is affected



Any changes in or could affect the Kakadu.  Although a lot of Kakadu is fresh water a rising sea level would some of the lower lying fresh water regions changing the ecology of the area.

Species on the Move

  • Centrostephanus rogersi has been found to be south to Tasmania
  • are migrating higher in the alps and feeding on
  • and are moving higher up into the alps and eating more of the

Changing Sea Level

We have found that the sea levels in the past have oscillated.  In the past 7500years sea levels have risen about . This is natural for interglacial warming period. If all the water on the ice caps melted the sea would rise 70 meters (this is not predicted). But could be inundated by sea level rises.