Sent in by Jovan (as the earlier link to Sky and Telescope). Global warming caused by co2 levels reaching 2300 parts per million. Currently we have just over 400 parts per million and alarmists are feeling very wobbly. WEhat researchers have found is that after the K/T boundary event temperatures shot up – in North Africa. One might suppose an asteroid strike would cause global cooling due to lots debris in the atmosphere – and the researchers acknowledge this. They claim it was followed by a period of global warming which lasted for 100,000 years. One has to take these uniformitarian numbers with a bit of scepticism – but the inference appears to be that climate changed as a result of the asteroid strike (and the change lasted a long time). The asteroid might have cause a change in the axis of rotation – warming up some areas and cooling others. The evidence comes from North Africa – and the claim is that global temperatures went up by 5 degrees. A shift in the desert zone might account for this – perhaps. See www.astronomy.com/news/2018/05/dino-doomsday-asteroid-baked-earth-for-10…
At www.hakaimagazine.com/news/what-bones-genes-and-space-singed-rocks-tell-… … which is another take on a migration route along the Pacific coast of North America. The image below of proposed ice sheets is interesting as it seems to infer glaciers across much of Alaska. Wonder where the mammoths lived?