Although the future ocean will begin to resemble the past greenhouse world, it will retain elements of the present «icehouse» world long into the future. (science.sciencemag.org)
... «Based on sea - level history, we have proposed that ice sheets existed for geologically short intervals (i.e., lasting ~ 100 ky) in the previously assumed ice - free Late Cretaceous - Eocene Greenhouse world (36).» (realclimate.org)
When many modern families of animals developed in a hot greenhouse world in which a warm ocean and land filled most of earths surface with fertile shallow seas and vast tropical jungles. (thenation.com)