ALT This picture illustrates a scene from northern Laurentia (North America) in the period a few weeks after the Chicxulub impact showing the onset of freezing weather and skies loaded with sulfur aerosols. The focus is on the last surviving dinosaurs - here a pair of T-Rex chicks, which somehow survived the initial impact phenomena, but which will soon succumb to the cold. (Image Credit ©James McKay – Creative Commons)