Fading Away
Another study was done on well-preserved cretaceous ecosystems in Antarctica and found two temperature spikes, including a larger one before the impact. The scientist pin the initial warming on staggering volcanic eruptions that created India’s Deccan Traps around the same time.
However critics say the fossil record is not complete enough for such an analysis. The take from this is that dinosaurs stood no chance regardless of whether the comet hit or not, they were doomed but also not so doomed.