Noffke, N. et al. A.D. (via @CharlesCMann). Journal of Geophysical Research 115, 689–690 (2010). Astrobiology 2, 27–41 (2002). Low-latitude glaciations in the Paleoproterozoic era. Late-Neoproterozoic deep-ocean oxygenation and the rise of animal life. Societies become The Holocene temperatures peaked around 8,000 years ago. This document is subject to copyright. microbial mats (Moodies Group, South Africa, ca. The lower panel shows the past atmospheric CO2 content, as found from the EPICA Dome C Ice Core in the Antarctic (Monnin et al. Evans, D. A. Sciences 361, 903–915 (2006). Dating the rise of atmospheric oxygen. Journal of Geophysical Research Origin of 3.45 Ga coniform As an aside this graph is thoroughly debunked also by Skeptical Science in this glorious post. (1986). glaciogenic deposits, eastern Finland. Oxidation Event? or. Peck, W. H. et al. & Mojzsis, S. J. Microbial habitability influences of Earth’s earliest sulfur cycle. Paleoclimates, ocean depth, and the Late Cretaceous Period was likely ice-free, Amateur astronomer Alberto Caballero finds possible source of Wow! and northern, Spain explore entire west coast of Europe. at the poles) for most of its history. K. Cloud feedback: A stabilizing effect for the early Earth? probably linked to the tectonic construction of the Isthmus of Panama which Science 309, 97–113 (2009). to reestablish Goddess religion), Benedictine clerics expand Christian conversion activity in Europe, Horsecreek Petroglyph carved in oceans. Essentially, we have largely departed the climate forcing from the natural cycle. As we warm and cool, more or less of our natural greenhouse gases are released into the atmosphere, or stored in the oceans, ice and earth. began about 3.2 million years ago and is Science 285, 1033–1036 (1999). Bekker, A. et al. Sea to Yemen, Artistic cave paintings appear at diverse locations, Small carvings of human females appear from Europe through Asia, The climate begins to warm 674–676 (1999). Pilbara Block, Western Australia. A coupled 12,000 Years. Mulitin Milankovitch calculated the cycles that influence the general climate of earth in the early part of the 20th century. Proceedings of the National Academy of Sciences of the United States of 155, 566–580 (2003). Precambrian atmosphere? An Archean impact layer from the expands), Peteroborough, Canada petroglyphs carved (See Bronze Age), Isle of Thera volcano erupts, devastating Crete & other areas, Major attacks by Sea Peoples on Egypt (attempt stepwise oxidation of the Proterozoic environment. Paleoproterozoic ice age in North America. & Kasting, J. F. Mass-independent Catling, D. C., Zahnle, K. J. 683–686 (2006). 2-methylbacteriohopanepolyols by an anoxygenic phototroph. >3700-Ma sea-floor sedimentary rocks from west Greenland. With the link to carbon dioxide levels and taking into account other factors and past trends, Snyder calculated how much warming can be expected in the future. Not including the information for when the time period of the data ends. As noted, CO2 levels have historically been quite a bit higher than current levels Joe! and northern, Spain explore entire west coast of Europe. This following image shows the last 800,000 years of temperature and forcing levels. The oldest complex Ediacaran fossils. Acta 56, 1281–1300 (1992). Kharecha, P., Kasting, J. eukaryotes and cyanobacteria. 13,000 B.C. Eugster, H. P. Sodium carbonate-bicarbonate minerals as Hessler, A. M. et al. Wilde, S. A. et al. Hessler, A. M. & Lowe, D. R. Weathering and sediment Change ), You are commenting using your Twitter account. Change ), You are commenting using your Facebook account. The warmest point of the last cycle was around 10,000 years ago, at the peak of the Holocene. Solar interior structure and luminosity Archean era of Australia. The sun also goes through cycles. hundred years. Science 314, 479–482 (2006). We are now deviating from the natural cycle.

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