While volcanism caused a temporary cold period, the effects had already worn off thousands of years before the meteorite, the ultimate cause of the dinosaur extinction event, impacted.
Impacts from large near-Earth objects are generally rare over a typical human lifetime. But they’re more frequent on a geological timescale of millions to billions of years. The best example may be a ...
"Modelling studies of the larger Chicxulub impact, which killed off the dinosaurs ... The larger of the two, which created the Popigai crater, was about as wide as Everest is tall. In addition to ...