Other commenters have touched on coral’s slow growth as a limiting factor, but I’d also like to bring up that temperature isn’t the only thing impacting coral reefs. One of the other big ones is a thing called ocean acidification, which is when high levels of CO2 in the atmosphere are partially absorbed by the sea water, causing it to become more acidic which can result in all sorts of health issues for sea life, especially calcifying organisms like coral.
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