Learn about the time period that took place 65 to 23 million years ago. 3 min read At the dawn of the Paleogene—the beginning of the Cenozoic era—dinosaurs, pterosaurs, and giant marine ...

Carbon dioxide levels are at a record high. Here's what you need to know. Carbon dioxide levels are at a record high. Here's what you need to know. Forecasts have painted a difficult picture for ...