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These features are not directly addressable by Earth\u2019s orbital changes described by Milankovitch. Here we show that a closed photochemical system exposed to a constant illumination source can sustain oscillations. In this simple conceptual model, the oscillations are intrinsic to the system and occur even in the absence of periodic radiative forcing. With proper adaptations to the Earth system, this oscillator explains the main features of past climate dynamics. Our model places photosynthesis and the carbon cycle as key drivers of climate change. We use this model to predict the relaxation of a 1,000 PgC pulse of CO<jats:sub>2<\/jats:sub>. The removal of 50% of this CO<jats:sub>2<\/jats:sub> will require one century, and will lead to a warmer and wetter future. However, more pronounced glaciation cycles emerge on the millennial timescale.<\/jats:p>","DOI":"10.1038\/s41598-020-68052-9","type":"journal-article","created":{"date-parts":[[2020,7,8]],"date-time":"2020-07-08T10:03:03Z","timestamp":1594202583000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Self-sustained oscillations and global climate changes"],"prefix":"10.1038","volume":"10","author":[{"given":"Luis G.","family":"Arnaut","sequence":"first","affiliation":[]},{"given":"Santiago","family":"Ib\u00e1\u00f1ez","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2020,7,8]]},"reference":[{"key":"68052_CR1","doi-asserted-by":"crossref","first-page":"1551","DOI":"10.1126\/science.1171477","volume":"324","author":"B H\u00f6nisch","year":"2009","unstructured":"H\u00f6nisch, B., Hemming, N. G., Archer, D., Siddall, M. & McManus, J. F. 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