We are reasonably sure, yes. Significantly more sure since January 2020. https://en.wikipedia.org/wiki/Cretaceous–Paleogene_extinction_event https://en.wikiped

We are reasonably sure, yes. Significantly more sure since January 2020. https://en.wikipedia.org/wiki/Cretaceous–Paleogene_extinction_event https://en.wikipedia.org/wiki/Cretaceous–Paleogene_extinctio... https://www.nytimes.com/2020/01/16/science/dinosaurs-extinction-meteorite-volcano.html https://www.nytimes.com/2020/01/16/science/dinosaurs-extinct... https://www.science.org/doi/10.1126/science.aay5055 https://www.science.org/doi/10.1126/science.aay5055 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7382232/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7382232/