{"id":10092,"date":"2019-12-14T12:00:00","date_gmt":"2019-12-14T17:00:00","guid":{"rendered":"http:\/\/all-geo.org\/highlyallochthonous\/?p=10092"},"modified":"2019-12-28T11:21:22","modified_gmt":"2019-12-28T16:21:22","slug":"oxygenation-of-earths-atmosphere-may-not-have-required-a-trigger-event-after-all","status":"publish","type":"post","link":"https:\/\/all-geo.org\/highlyallochthonous\/2019\/12\/oxygenation-of-earths-atmosphere-may-not-have-required-a-trigger-event-after-all\/","title":{"rendered":"Oxygenation of Earth&#8217;s atmosphere may not have required a trigger event after all"},"content":{"rendered":"\n<p>In Earth history, there have been 3 abrupt jumps in atmospheric oxygen. A evolutionary or tectonic trigger is usually invoked, but <a href=\"https:\/\/science.sciencemag.org\/content\/366\/6471\/1333\">a new study just published in Science<\/a> suggests all you need is gradual oxidation of earth&#8217;s surface plus feedbacks within &amp; between the P(hosporous), C(arbon) and O(xygen) cycles.<\/p>\n\n\n\n<p>A timely reminder that the Earth system is complex and full of non-linear responses to anything which prods it. Any change doesn&#8217;t just depend on the size of the prod, but also the state of the planet when it is being prodded. Kicking a pebble in a valley and kicking one on a steep scree slope can lead to very different results! Or more accurately in this case, you can slowly add dozens of pebbles to a pile and nothing happens &#8211; until you add the last one that collapses the whole thing.<\/p>\n\n\n\n<p>If you ever hear about climate &#8216;tipping points&#8217;, this is what is meant: we may get to where the accumulated changes that our civilisation is imposing on the Earth system push it into a state where even a small further push is like the final pebble on the pile.<\/p>\n\n\n\n<p>If you ever hear about climate &#8216;tipping points&#8217;, this is what is meant: we may get to where the accumulated prods that our civilisation is making on the Earth system push it into a state where even a small further prod is like the final pebble on the pile. Most importantly, once the threshold is crossed, and non-linear changes have started cascading through the system, we are all along for the ride.<\/p>\n\n\n\n<figure class=\"wp-block-embed-youtube aligncenter wp-block-embed is-type-video is-provider-youtube wp-embed-aspect-4-3 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/www.youtube.com\/watch?v=60loeoblu0M\n<\/div><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>In Earth history, there have been 3 abrupt jumps in atmospheric oxygen. A evolutionary or tectonic trigger is usually invoked, but a new study just published in Science suggests all you need is gradual oxidation of earth&#8217;s surface plus feedbacks &hellip; <a href=\"https:\/\/all-geo.org\/highlyallochthonous\/2019\/12\/oxygenation-of-earths-atmosphere-may-not-have-required-a-trigger-event-after-all\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"aside","meta":{"footnotes":""},"categories":[32,21,8,35,4,27,28,29,364],"tags":[847,590,848,849],"class_list":["post-10092","post","type-post","status-publish","format-aside","hentry","category-archean","category-climate-science","category-deep-time","category-geochemistry","category-geology","category-palaeozoic","category-past-worlds","category-proterozoic","category-society","tag-earth-system","tag-feedbacks","tag-great-oxygenation-event","tag-tipping-points","post_format-post-format-aside"],"_links":{"self":[{"href":"https:\/\/all-geo.org\/highlyallochthonous\/wp-json\/wp\/v2\/posts\/10092","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/all-geo.org\/highlyallochthonous\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/all-geo.org\/highlyallochthonous\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/all-geo.org\/highlyallochthonous\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/all-geo.org\/highlyallochthonous\/wp-json\/wp\/v2\/comments?post=10092"}],"version-history":[{"count":2,"href":"https:\/\/all-geo.org\/highlyallochthonous\/wp-json\/wp\/v2\/posts\/10092\/revisions"}],"predecessor-version":[{"id":10094,"href":"https:\/\/all-geo.org\/highlyallochthonous\/wp-json\/wp\/v2\/posts\/10092\/revisions\/10094"}],"wp:attachment":[{"href":"https:\/\/all-geo.org\/highlyallochthonous\/wp-json\/wp\/v2\/media?parent=10092"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/all-geo.org\/highlyallochthonous\/wp-json\/wp\/v2\/categories?post=10092"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/all-geo.org\/highlyallochthonous\/wp-json\/wp\/v2\/tags?post=10092"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}