Great Barrier reef the largest its been since recording started., page-44

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    Ridd received a Bachelor of Science degree in Physics from James Cook University in 1978, and later a PhD in Physics from that same institution in 1980.[2] At this time, he also joined the Australian Institute of Marine Science. He started studying the Great Barrier Reef in 1984, mainly focusing on ocean currents and the movement of sediment.[3][better source needed]

    I would say he has a fair knowledge of the GBR.

    https://en.wikipedia.org/wiki/Peter_Ridd


 
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