Note that it said "civilization", not "human kind". Fast climate change could innudate coastal regions, forcing mass migrations inland. Fast climate change may exceed agriculture's ability to adapt, leading to food shortages.
If the starving workers that keep infrastructure running (power plants, sewage plants, municipal water suppliers, etc) decide to go hunt for food instead of work, then that infrastructure may fail.
Once basic infrastructure fails, it won't take long for civilization to collapse too.
If the starving workers that keep infrastructure running (power plants, sewage plants, municipal water suppliers, etc) decide to go hunt for food instead of work, then that infrastructure may fail.
Once basic infrastructure fails, it won't take long for civilization to collapse too.