As a result of decades of work and a large international collaboration, climate scientists have finally compiled a continuous, high-fidelity record of variations in Earth’s climate extending 66 million years ago. Earth’s 4 Main Climate States The record reveals four main climate states dubbed as: Hothouse Warmhouse Coolhouse Icehouse  Within each major climate states, the climate shows rhythmic variations corresponding to changes in Earth’s orbit around the sun. “We’ve known for a long time that the glacial-interglacial cycles are paced by changes in Earth’s orbit, which alter the amount of solar energy reaching Earth’s surface, and astronomers have been computing … Continue reading Study Reveals Earth’s 4 Main Climate States for the Past 66 Million Years