His chief interest was in the study of the Great Barrier Reef.
The Great Barrier Reef was born when sea levels rose 10,000 years ago.
Matters came to a head at a small island on the Great Barrier Reef.
Most of the Great Barrier Reef has been made into a huge national park.
Scientists are saying, the Great Barrier Reef, will be gone, within 20 years.
The Great Barrier Reef is home to thousands of fish.
The Great Barrier Reef is the largest structure made by living things.
It is difficult to work out the age of the Great Barrier Reef.
The Great Barrier Reef has 14000 different plants and animals.
It is the largest island on the Great Barrier Reef.
Approximately two million people visit the Great Barrier Reef each year.
During this period, he repeatedly visited the Great Barrier Reef as part of his work.
These services established the Great Barrier Reef as a destination for tourists.
Then there's the Great Barrier Reef, just 40 minutes off shore.
In the sea of social class, money remains our Great Barrier Reef.
Water quality was first identified as a threat to the Great Barrier Reef in 1989.
"If nothing else, we could fit in a visit to the Great Barrier Reef."
If you can't get to the Great Barrier Reef it's the next best thing.
"You can't go home without seeing the Great Barrier Reef."
The islands of the Great Barrier Reef have 2,195 known plant species.
