A measured decline in Great Barrier Reef coral calcification is published

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Analysis of growth bands in massive Porites colonies, which record annual increments like tree rings and can be read back over centuries, reported a decline of about fourteen per cent in calcification since 1990 — a change described by the authors as unprecedented in the preceding four centuries of the record. The finding was significant because it measured a slowdown in reef building on colonies that had not bleached and had not died, separating the chemistry problem from the heat problem.

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