Note that the article states that the described events caused mass extinction because of heat-trapping carbon dioxide. So it was really fast global warming. Not sun-obscuring ash and smoke in the atmosphere, causing plants to die from loss of photosynthesis, thereby starving the dinosaurs to death. No, it just got uncomfortably warm for them and they died. From heat exhaustion.
It was caused by SUV’s.
Surprise Unexpected Volcanism.....................