Seems a bit what? I really wish I could take you more seriously. There is undoubted, undeniable evidence that human factors caused this bleaching effect. Yes humans are doing it ALL.
"The results suggest that the thermal toler- ances of reef-building corals are likely to be exceeded every year within the next few decades. Events as severe as the 1998 event, the worst on record, are likely to become commonplace within 20 years. Most information suggests that the capacity for acclimation by corals has already been exceeded, and that adap- tation will be too slow to avert a decline in the quality of the worldís reefs. The rapidity of the changes that are predicted indicates a major problem for tropical marine ecosystems and suggests that unrestrained warming cannot occur without the loss and degradation of coral reefs on a global scale."
He means not up for debate in the "peer reviewed scientific publishing" sense not, "up for debate in your anecdotal experience" sense.
Which is why the science department the position of every single university in the western world agrees with his position. And NASA, and the CSIRO, I could go on.
It is not up for debate.