still there is not one direct answer as to causation of the reef dying
Are you unable to operate Google?
Let me help you then: Google: How does climate change affect coral reefs
Which of the top 1000 results do you prefer?
How about the first one from NOAA? https://oceanservice.noaa.gov/facts/coralreef-climate.html
How about one with primary sources included? https://www.skepticalscience.com/coral-bleaching.htm
So global scale coral bleaching is primarily driven by ocean warming primarily driven by human emission of C02. Secondary drivers include ocean acidification (also due to C02), sea level rise leading to sedimentation (warming via CO2), changes in weather patterns (climate change via CO2), localized pollutants and runoff (human activity), and altered ocean currents and a few more.
Is this going anywhere or just a waste of time?