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The main climate state change is between periodical glacial and interglacial cycles in Earth history, studied from climate proxies. The climate system is responding to the current climate forcing and adjusts following climate sensitivity to reach a climate equilibrium, Earth's energy balance. Model simulations suggest that the current interglacial climate state will continue for at least another 100,000 years, due to CO2 emissions - including complete deglaciation of the Northern Hemisphere.
The orbital forcing from Milankovitch cycles is a periodical factor to determine Earth's energy budget and responsible for the glacial cycles on Earth, depending on the radiative equilibrium. Other factors include processes and change in geospheric systems. These include oceanic processes (such as oceanic circulation), biotic processes, variations in solar radiation received by Earth, plate tectonics, volcanism, albedo vegetation changes and human-induced alterations of the natural world.
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