{"id":97751,"date":"2023-04-06T09:02:00","date_gmt":"2023-04-06T13:02:00","guid":{"rendered":"https:\/\/www.shortform.com\/blog\/?p=97751"},"modified":"2023-04-06T11:07:46","modified_gmt":"2023-04-06T15:07:46","slug":"what-was-earth-like-before-humans","status":"publish","type":"post","link":"https:\/\/www.shortform.com\/blog\/what-was-earth-like-before-humans\/","title":{"rendered":"What Was Earth Like Before Humans? &#8220;Visit&#8221; the Primeval World"},"content":{"rendered":"\n<p>What was Earth like before humans? In what environment did the human race emerge?<\/p>\n\n\n\n<p>In <em>The World Without Us<\/em>, science journalist Alan Weisman asks what would happen if the human race vanished overnight. In an effort to figure that out, he begins by understanding what the primeval world was like long before the advent of human civilization.<\/p>\n\n\n\n<p>Continue reading to learn about the Earth before humans.<\/p>\n\n\n\n<!--more-->\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-the-earth-before-humans\">The Earth Before Humans<\/h2>\n\n\n\n<p>What was Earth like before humans? The planet of the last few hundred million years was a world of lush forests, seas brimming with life, and giant creatures that wandered the land. Weisman describes the Earth before humans\u2014the primeval world\u2014with ages of warmth punctuated by periods of glaciation and sudden <a href=\"https:\/\/www.shortform.com\/blog\/mass-extinction-timeline\/\">mass extinction events<\/a> until humanity emerged from our African cradle and spread to every continent on the planet.<\/p>\n\n\n\n<p>The seas are the source of all life on Earth and are home to the true rulers of the world\u2014the microbial life that existed for eons before larger plants and animals evolved, and will be here long after the rest of us die out.&nbsp;<\/p>\n\n\n\n<p>(Shortform note: It\u2019s not a stretch to claim that microbes, not humans, are the dominant life form on the planet. In <a href=\"https:\/\/www.shortform.com\/app\/book\/i-contain-multitudes\" target=\"_blank\" rel=\"noreferrer noopener\"><em>I Contain Multitudes<\/em><\/a>, Ed Yong explains that not only were microbes the only living organisms for the majority of history, but they also <a href=\"https:\/\/www.shortform.com\/app\/book\/i-contain-multitudes#history-and-functions-of-microbes\" target=\"_blank\" rel=\"noreferrer noopener\">created the preconditions for life as we know it to evolve<\/a>. For example, the nitrogen\/oxygen atmosphere we take for granted is merely the byproduct of billions of years of bacterial photosynthesis, without which <a href=\"https:\/\/www.anl.gov\/article\/unlocking-the-secrets-of-earths-early-atmosphere\" target=\"_blank\" rel=\"noreferrer noopener\">our air would resemble the carbon dioxide atmospheres of Mars and Venus<\/a>. Microbial life, in other words, was responsible for climate change on the grandest scale imaginable.)<\/p>\n\n\n\n<p>The microbes form the basis of the ecosystem, feeding corals, fish, and all manner of life that feed larger predators. The land, for hundreds of millions of years, was dominated by woodlands and savannahs that supported a wide diversity of species. Nevertheless, Weisman points out that the pre-human past wasn\u2019t an era of Edenic bliss. The geologic record shows a history of worldwide extinctions, the worst of which occurred 250 million years ago at the end of the Permian period when 90% of all species died out.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Extinctions in the Fossil Record<\/strong><br><br>Geologists chart the history of life on Earth by studying the fossilized remains of ancient creatures in different <a href=\"https:\/\/study.com\/learn\/lesson\/rock-strata-overview-importance.html\" target=\"_blank\" rel=\"noreferrer noopener\"><em>strata<\/em><\/a> (layers) of rock. According to <a href=\"https:\/\/education.nationalgeographic.org\/resource\/superposition\/\" target=\"_blank\" rel=\"noreferrer noopener\">the law of superposition<\/a>, new layers of rock are created on top of old ones, meaning that the deeper the layer of rock you examine, the further back in time you are looking. Thus, by looking at the fossils in each layer of rock, we can <a href=\"https:\/\/evolution.berkeley.edu\/lines-of-evidence\/fossil-evidence\/\" target=\"_blank\" rel=\"noreferrer noopener\">paint a picture of life on Earth<\/a> at different times in its history. In <a href=\"https:\/\/www.shortform.com\/app\/book\/your-inner-fish\" target=\"_blank\" rel=\"noreferrer noopener\"><em>Your Inner Fish<\/em><\/a>, paleontologist Neil Shubin points out that <a href=\"https:\/\/www.shortform.com\/app\/book\/your-inner-fish\/chapter-1\" target=\"_blank\" rel=\"noreferrer noopener\">only a tiny fraction of plants and animals get preserved as fossils<\/a>, and only a fraction of those are discovered by researchers. Nevertheless, the evidence is clear that life in the past was not as it is today.<br><br>Another fact that fossils make abundantly clear is that at several points in our planet\u2019s history, life has died out on a massive scale. While <a href=\"https:\/\/www.nationalgeographic.com\/science\/article\/dinosaur-extinction\" target=\"_blank\" rel=\"noreferrer noopener\">the sudden demise of the dinosaurs<\/a> (and 75% of all species on the planet) 65 million years ago is certainly the best known, it\u2019s only the most recent of what geologists call the <a href=\"https:\/\/www.amnh.org\/shelf-life\/six-extinctions\" target=\"_blank\" rel=\"noreferrer noopener\">\u201cBig Five\u201d<\/a> mass extinctions we\u2019re aware of. In <a href=\"https:\/\/www.shortform.com\/app\/book\/the-sixth-extinction\" target=\"_blank\" rel=\"noreferrer noopener\"><em>The Sixth Extinction<\/em><\/a>, science journalist Elizabeth Kolbert expresses the view of many biologists and climate scientists that the world is undergoing another mass <a href=\"https:\/\/www.shortform.com\/blog\/major-extinction-events\/\">extinction event<\/a>, this one precipitated by the human race.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>After each extinction event, life has rebounded and evolved in new directions.<\/strong> Millions of years after the Permian extinction, the age of the dinosaurs began. Once they were gone, other giant creatures such as mammoths, ground sloths, and saber-toothed tigers roamed and ruled the wild. More frequent than mass extinction events are the planet\u2019s ice ages, when glaciers advance, habitats shrink, and forests go into retreat. Weisman says that it was probably during one of these ice ages that our pre-human ancestors were forced out of the trees to look for food on the ground. In order to adapt, we learned to walk upright, use tools, and look for more fertile hunting grounds.<\/p>\n\n\n\n<p>(Shortform note: The actual genesis of the modern human race is somewhat more complicated than Weisman suggests. In <a href=\"https:\/\/www.shortform.com\/app\/book\/sapiens\" target=\"_blank\" rel=\"noreferrer noopener\"><em>Sapiens<\/em><\/a>, Yuval Noah Harari explains that at first, <a href=\"https:\/\/www.shortform.com\/app\/book\/sapiens\/part-i\" target=\"_blank\" rel=\"noreferrer noopener\">at least eight \u201chuman\u201d species spread from Africa to other parts of the world<\/a>. Ours, <em>homo sapiens<\/em>, outcompeted the others due to what Harari calls the <a href=\"https:\/\/www.shortform.com\/app\/book\/sapiens\/chapter-2\" target=\"_blank\" rel=\"noreferrer noopener\">Cognitive Revolution<\/a>\u2014a mutation that reshaped our ancestors\u2019 brains to allow for greater language capacity, enhanced social interaction, and the capacity for <a href=\"https:\/\/www.shortform.com\/blog\/abstract-thinking-ability\/\">abstract thought<\/a> and problem-solving.)<\/p>\n\n\n\n<p>Moving outward from the African savannahs, our ancestors spread across Asia and Europe, and then across now-submerged land into Australia and the Americas. In the not-too-distant geologic past, North America was home to more giant species than are found in present-day Africa. However, 13,000 years ago, the majority of American megafauna went extinct. Many historians attribute this die-off to the arrival of the prehistoric Clovis culture, a wave of ancient hunter-gatherers known for their distinctive spearheads ideal for killing large game. Weisman argues that large mammals survived in Africa and not in America because African animals evolved in concert with humans and learned to be wary in ways that American wildlife didn\u2019t.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>The Clovis Culture<\/strong><br><br>The Clovis people Weisman mentions are named for the town of Clovis, New Mexico, in which <a href=\"https:\/\/www.smithsonianmag.com\/history\/the-clovis-point-and-the-discovery-of-americas-first-culture-3825828\/\" target=\"_blank\" rel=\"noreferrer noopener\">their ancient spearheads were first discovered<\/a>. It\u2019s believed that <a href=\"https:\/\/www.newmexico.org\/blog\/post\/the-story-of-the-clovis-people\/\" target=\"_blank\" rel=\"noreferrer noopener\">the Clovis people came to the Americas about 13,000 years ago<\/a> via the land bridge that once existed across the Bering Strait between present-day Russia and Alaska. Though the Clovis people were long believed to have been the first immigrants to the western hemisphere, new discoveries suggest that <a href=\"https:\/\/www.usatoday.com\/story\/news\/nation\/2022\/08\/03\/when-did-humans-settle-north-america\/10223278002\/\" target=\"_blank\" rel=\"noreferrer noopener\">humans settled in the Americas long before the Clovis culture\u2019s arrival<\/a>, perhaps by as much as 20,000 years prior.<br><br>Opponents of the hypothesis that early human settlers were responsible for wiping out the Americas\u2019 large animals point to data that shows <a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0277379113004678\" target=\"_blank\" rel=\"noreferrer noopener\">megafauna extinctions before the existence of the Clovis people<\/a>. However, if other groups of humans migrated from Asia to the Americas much earlier than previously thought, that must also be taken into account.<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>What was Earth like before humans? In what environment did the human race emerge? In The World Without Us, science journalist Alan Weisman asks what would happen if the human race vanished overnight. In an effort to figure that out, he begins by understanding what the primeval world was like long before the advent of human civilization. Continue reading to learn about the Earth before humans.<\/p>\n","protected":false},"author":9,"featured_media":97760,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[39,160],"tags":[962],"class_list":["post-97751","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-history","category-science","tag-the-world-without-us","","tg-column-two"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.3 (Yoast SEO v24.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What Was Earth Like Before Humans? &quot;Visit&quot; the Primeval World - Shortform Books<\/title>\n<meta name=\"description\" content=\"Alan Weisman wonders what would happen if humanity vanished overnight. He starts by asking this: What was Earth like before humans? 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