We are currently in which climate state described by the terms Greenhouse Earth and Icehouse Earth?

We are currently in which climate state described by the terms Greenhouse Earth and Icehouse Earth?

• A. Greenhouse Earth
• B. Icehouse Earth
• C. Both
• D. Neither

Answer: (B)

Understanding long-term climate states called greenhouse and icehouse helps explain why we categorize Earth's current climate as an Icehouse Earth. Greenhouse Earth refers to periods when global temperatures are warm enough that large polar ice sheets do not form, leading to higher sea levels. Icehouse Earth refers to times when substantial polar ice exists and global temperatures are cooler, with glaciers advancing and retreating. Today, Earth still has large ice sheets in Antarctica and Greenland and shows glacial–interglacial cycles, even though human-caused warming is raising temperatures. That combination fits the Icehouse Earth pattern, not a greenhouse one. So the best choice is Icehouse Earth.

Understanding long-term climate states called greenhouse and icehouse helps explain why we categorize Earth's current climate as an Icehouse Earth. Greenhouse Earth refers to periods when global temperatures are warm enough that large polar ice sheets do not form, leading to higher sea levels. Icehouse Earth refers to times when substantial polar ice exists and global temperatures are cooler, with glaciers advancing and retreating. Today, Earth still has large ice sheets in Antarctica and Greenland and shows glacial–interglacial cycles, even though human-caused warming is raising temperatures. That combination fits the Icehouse Earth pattern, not a greenhouse one. So the best choice is Icehouse Earth.