Do we really need more evidence for global warming?

On the heels of recent scientific studies showing unprecedented rates of ice melt in Antarctica and Greenland comes a new study showing that high Caribbean Sea temperatures that would have been equivalent to every city in the U.S. having a record high temperature for several months are causing die offs of coral reefs there. Some of these reefs are hundreds of years old so you can't chalk it up to normal cyclical sea temperature fluctuations like El Nino in the Pacific. Is it coincidental that we had some of the strongest hurricanes on record spin up in the Carribean last summer? Seems unlikely to me.