The climate during the Cretaceous period was a greenhouse climate with warm, moist conditions and no polar ice caps, which allowed for a diversity of life, including dinosaurs and lush vegetation.
The worldwide climate of the Cretaceous period can best be described as a greenhouse climate. This period was characterized by higher global temperatures and higher sea levels compared to today, resulting in warm and moist environments across much of the planet.
There were no polar ice caps, and the vegetation was lush, with dense forests even at high latitudes. The greenhouse conditions allowed for a high diversity of life, including large dinosaurs and many plant species.
The Cretaceous is also known for having several intervals of extremely high levels of carbon dioxide in the atmosphere, which contributed further to the warm greenhouse conditions. The oceans were warmer, and marine life, including a rich diversity of ammonites, molluscs, and fishes, thrived in these balmy seas. All these factors indicate that a major feature of the Cretaceous climate was its warm, stable temperatures across the globe.