Atmospheric CO2 dip 200m years ago helped dinosaurs migrate

Long-necked dinosaurs emerged in South America 230 million years ago, but it took 15 million years before they showed up in Greenland because high levels of of atmospheric carbon dioxide. https://www.dailymail.co.uk/sciencetech/article-9263529/Dip-atmospheric-CO2-200million-years-ago-helped-dinosaurs-migrate-South-America-Greenland.html?ns_mchannel=rss&ns_campaign=1490&ito=1490