Have we seen any examples of a destroyed coral reef eco-system and its effects on the community? How long will it take for global warming to take its toll on this valuable eco-system?

Effects are already visible in every ecosystem: coral bleaching, changes in flowering seasons, changes in bird and insect and mammal and fish migrations, melting of glaciers, thinning of polar ice caps, disappearance of cloud forests, warming of groundwater, changes in tree ting thickness, etc.