The Great Barrier Reef is the world's largest reef system located off Australia's northeast coast, composed of thousands of individual reefs. Coral reefs are unique ecosystems with high biodiversity but are under threat from rising ocean temperatures and acidification caused by climate change. As the oceans continue to warm and acidify due to greenhouse gas emissions, coral reefs face serious risks as corals grow slowly and are sensitive to changes in ocean conditions.

1. Report By: Jessica Colquhoun.

2. • The Great Barrier Reef is the largest reef system in the world and widely considered
one of the seven wonders of the natural world.
• It is made of Thousands of reefs.

3. • The Great Barrier Reef is in Australia’s north-eastern coast.

4. • Coral reefs are unique ecosystems that
teem with life - but this situation is changing.
• An increasing amount of green house
gases is warming up oceans.
• Warmer sea waters and ocean acidification
both pose a serious threat to the worlds
coral reefs.

5. • Ocean acidification is the evil twin of climate change.
• Some scientists predict that, as a worst-case scenario, sea water will have a pH of
7.8 by the end of the century.
• An ocean pH of below 7.95

6. • Coral reefs are living communities of tiny animals called polyps.
• Corals have A clever system for producing their own food.
• Tropical corals grow very very slowly- Around 1-3 centimetres a year.

7. • Global warming caused
by us has raised the
ocean temperature
0.1f .This warming has
occurred from the
surface to a depth of
about 2,300 feet .That is
really deep!!