What is really sad is as scuba divers we have been seeing and witnessing the coral reefs dying in just the last ten years (these are the only reefs in the US). My wife dove at sand key reef a few weeks ago and reported it is now dead (brought tears to my eyes). Took a 100,000 years to make, and we killed in ten yrs (sad). The really sad part was she was with a group, and a half dozen or so out of that group were diving down and breaking off coral to keep (which takes 10,000 yrs to grow to that state).
Ten years does not a trend make, although maybe your fringe area of coral-viability zone is more fragile. Deeper into the tropics like my part of the US, I am actually seeing a revival of apparently dead coral in my backyard. Decades ago it appeared to be barren and stepped on... I only snorkeled there for the exercise and to watch the still-present fish near the dropoff. But last 10 years the skins started regrowing on apparently dead coral. Now bright and healthy coral seems to be meeting a wave of algae, which I read was introduced by past well-meaning scientists (to feed fish?) rather than some global factor.
This weekend I tried sailing in a shallow area which keeps the onshore waves down. Overheard a tour guide give his busload a "good old days" sermon about how you used to be able to wade a half mile to that island, but look now at the shoreline and all eroding away. Well even near high tide, I still could barely find enough depth to lower my rudder. I wanted to cool off, and had to stumble forever just to find 2 feet of water to immerse myself. My hull seemed to be covered with dog poo after pulling out, and I saw the eroded shore consisted of sort of soft potting soil. This spot's erosion appears to come from cheap fill in the war days when a P-38 runway was quickly installed, rather than sinister enviro-trends.
Not that bad trends don't exist, but some project those excessively. I remember when Crystal Springs manatees were almost always marked with gross propeller wounds, and when Hawaii turtles generally had huge white tumor growths. There is a pessimism that can come from aging rather than reality. The young bond with things at a peak of their cycle. When older, they focus on what cycled down and ignore what cycled up. This has been observed in travel book writing over the centuries... what is "ruined" is eternally rediscovered as wonderful by younger writers, who later decide it is ruined.
My Hobie i12s... sailboat in a suitcase! Look for it in THIS