Harry Potter fans know what a Dementor is. To quote Remus Lupin it is a creature that:
glories in decay and despair, they drain peace, hope, and happiness out of the air around them… get too near a Dementor and every good feeling, every happy memory will be sucked out of you.
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Peter Ridd is a marine geophysicist who has studied the reef since 1984 and an adjunct fellow at the Institute of Public Affairs.
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