This will force tropical conditions toward higher latitudes. Europe, Canada, Siberia, Argentina, South Africa, and Australia will grow more tropical fauna just as they did 10,000 years ago when the Woolly Mammoths roamed the Earth. But as the tropical weather conditions migrate closer to the poles and encounter a much thinner atmosphere, the skies will begin to rain copious amounts of water. Vast areas of land and forests will be flooded and buried. The constant rain will cause the upper atmosphere to cool to extremely low temperatures precipitating a severe cooling of the nitrogen in the upper atmospheres.
Paleoclimatology shows a sudden drop in oxygen levels shortly after the storm .
The intense cold in the higher latitudes will interact with the warm tropical conditions of the middle latitudes causing incredible wind, lightning storms and floods literally of biblical proportion. Glaciers will instantly return at least as far towards the equator as the 45 latitudes. The question isn't whether or not this will happen. For over 135 million years the dinosaurs lived on this planet in a very stable ecosystem. About 65 million years ago an asteroid changed all that.