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. • 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 will cause coral exoskeletons to begin dissolving in the
ocean .
