We've reached the first tipping point (99% probability even if we'd manage to keep the 1.5 degree target) This means coral reefs on any meaningful scale will be lost. Nearly a billion people and a quarter of all marine life depend on them.
& 
To roughly quote Maja Göpel: People don't seem to grasp the irreversibility of such changes in ecological systems.
‘New reality’ as world reaches first climate tipping point | University of Leeds
Researchers in Leeds have joined experts from across the world in warning that Earth is reaching the first of many climate tipping points that will...
Global Tipping Points
Global Tipping Points | understanding risks & their potential impact
Harmful tipping points in the natural world threaten humanity by disrupting life support systems and societal stability.