{"id":5032,"date":"2024-01-23T17:05:16","date_gmt":"2024-01-23T10:05:16","guid":{"rendered":"https:\/\/wam.vn\/en\/?p=5032"},"modified":"2024-01-23T17:05:16","modified_gmt":"2024-01-23T10:05:16","slug":"understanding-past-global-warming-insights-from-the-petm-era","status":"publish","type":"post","link":"https:\/\/wam.vn\/en\/understanding-past-global-warming-insights-from-the-petm-era\/","title":{"rendered":"Understanding Past Global Warming: Insights from the PETM Era"},"content":{"rendered":"<p><em><strong>TLDR<\/strong>: PETM event 56 million years ago caused global warming, expanded rainforests, and impacted marine life; offers insights for today&#8217;s climate change.<\/em><\/p>\n<p>This article is a summary of a You Tube video &#8220;The Last Time the Globe Warmed&#8221; by PBS Eons<br \/>\n<iframe title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/ldLBoErAhz4?si=oeI6vBOfdjwRzvpp\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<h3>Key Takeaways:<\/h3>\n<ol>\n<li><strong>Ancient Warming Event &#8211; Paleocene-Eocene Thermal Maximum (PETM):<\/strong> An event 56 million years ago, where global temperatures rose 5 to 8 degrees Celsius over 20 thousand years, more at higher latitudes.<\/li>\n<li><strong>Rainforests in the Arctic:<\/strong> During PETM, tropical rainforest vegetation expanded far beyond current equatorial regions, with evidence found in North America, Europe, and Asia.<\/li>\n<li><strong>Carbon Dioxide Spike:<\/strong> A significant increase in carbon dioxide and other greenhouse gases in the ocean was recorded, likely from organic sources.<\/li>\n<li><strong>Sources of Greenhouse Gases:<\/strong> Possible causes include massive wildfires, volcanic activity heating coal, or melting of methane hydrates.<\/li>\n<li><strong>Positive Feedback Loop:<\/strong> Warming led to more methane release from hydrates, exacerbating the greenhouse effect.<\/li>\n<li><strong>Comparatively Slower Ancient Carbon Emission:<\/strong> During PETM, up to 1.7 billion metric tons of carbon were released annually, less than current rates.<\/li>\n<li><strong>Impact on Life:<\/strong> The warming led to flourishing rainforests and diversification of early mammals, especially primates. However, marine life suffered due to heat and ocean acidification.<\/li>\n<li><strong>Marine Life Hardship:<\/strong> High ocean temperatures and acidification devastated plankton populations and coral reefs.<\/li>\n<li><strong>Cooling and Ice Caps Formation:<\/strong> The climate eventually cooled, leading to the formation of polar ice caps towards the end of the Eocene Epoch.<\/li>\n<li><strong>Implications for Current Climate Change:<\/strong> Today&#8217;s warming rate exceeds that of the PETM, providing insights into potential climate change impacts.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>PETM event 56 million years ago caused global warming, expanded rainforests, and impacted marine life; offers insights for today&#8217;s climate change.<\/p>\n","protected":false},"author":3,"featured_media":5033,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[44],"tags":[],"class_list":["post-5032","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science","category-44","description-off"],"_links":{"self":[{"href":"https:\/\/wam.vn\/en\/wp-json\/wp\/v2\/posts\/5032","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wam.vn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wam.vn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wam.vn\/en\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/wam.vn\/en\/wp-json\/wp\/v2\/comments?post=5032"}],"version-history":[{"count":1,"href":"https:\/\/wam.vn\/en\/wp-json\/wp\/v2\/posts\/5032\/revisions"}],"predecessor-version":[{"id":5034,"href":"https:\/\/wam.vn\/en\/wp-json\/wp\/v2\/posts\/5032\/revisions\/5034"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/wam.vn\/en\/wp-json\/wp\/v2\/media\/5033"}],"wp:attachment":[{"href":"https:\/\/wam.vn\/en\/wp-json\/wp\/v2\/media?parent=5032"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wam.vn\/en\/wp-json\/wp\/v2\/categories?post=5032"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wam.vn\/en\/wp-json\/wp\/v2\/tags?post=5032"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}