{"id":469473,"date":"2026-09-09T07:26:20","date_gmt":"2026-09-09T14:26:20","guid":{"rendered":"https:\/\/climatescience.press\/?p=469473"},"modified":"2026-09-09T07:27:50","modified_gmt":"2026-09-09T14:27:50","slug":"when-oxygen-soared-and-rainforests-crashed-extreme-climate-giant-species-and-the-dramatic-impacts-of-the-carboniferous-period-359-299-million-years-ago","status":"publish","type":"post","link":"https:\/\/climatescience.press\/?p=469473","title":{"rendered":"When Oxygen Soared and Rainforests Crashed: Extreme Climate, Giant Species, and the Dramatic Impacts of the Carboniferous Period (359\u2013299 Million Years Ago)"},"content":{"rendered":"\n
\"Illustration
AI generated by Grok<\/figcaption><\/figure>\n\n\n\n

A 2026 Nature study challenges the long- standing idea that high atmospheric oxygen alone enabled giant insects like Meganeura (and related griffinflies\/Meganisoptera) to reach enormous sizes, showing that oxygen diffusion limits via tracheoles were likely not the main constraint.<\/strong><\/p>\n\n\n\n

About 300 million years ago, during the late Carboniferous (and into the early Permian), Earth hosted flying insects far larger than any alive today. Meganeura monyi and the even larger Meganeuropsis permiana had wingspans of roughly 65- 75 cm (about 70 cm is commonly cited), with body mass estimates for the biggest forms ranging from tens of grams up to 100- 150 g in some engineering analyses. <\/p>\n\n\n\n

They resembled oversized dragonflies but belonged to an extinct order (Meganisoptera\/griffinflies), acted as aerial predators, and lived in swampy, forested environments. Other arthropods of the era, such as the millipede- like Arthropleura (up to ~2.5 m), were also gigantic.<\/p>\n\n\n\n

Insects breathe through a network of tubes (tracheae) that branch into tiny tracheoles delivering oxygen directly to tissues by diffusion, no lungs or blood- based oxygen transport like vertebrates.<\/p>\n\n\n\n

For decades, scientists linked Palaeozoic insect gigantism to higher atmospheric oxygen (estimates often ~30- 35% versus ~21% today), which would have eased diffusion limits and allowed larger body sizes. The later drop in oxygen was thought to explain why such giants vanished. Supporting observations included some modern insects growing larger in oxygen-enriched air and allometric patterns in tracheal investment.<\/p>\n\n\n\n

The fossil record itself is more complex than a simple oxygen- size correlation: maximum insect sizes tracked oxygen somewhat for long periods but decoupled later, and giant forms persisted into times of lower oxygen. The full picture remains incomplete; researchers emphasize multifactorial causes.<\/p>\n\n\n\n

In short, Meganeura and its relatives show that the largest insects in Earth\u2019s history were shaped by more than oxygen levels alone. The new work undermines a popular textbook explanation while leaving the precise drivers of their rise and fall as an open scientific question.<\/strong> <\/p>\n\n\n

\n
\"Graph
A graph showing changes in Earth\u2019s atmospheric oxygen levels over the past 550 million years. The blue curve tracks oxygen concentration through different geological periods, from the Cambrian to the present day. Credit: Nature<\/figcaption><\/figure>\n<\/div>\n\n\n

Many species thrived in the Carboniferous Period (\u2248359- 299 million years ago) under elevated atmospheric oxygen levels, estimated at roughly 25- 35% (versus ~21% today).<\/strong><\/p>\n\n\n\n

This hyperoxic atmosphere is widely linked to the growth of unusually large arthropods (via their tracheal respiratory systems) and supported diverse terrestrial ecosystems in the vast coal forests and wetlands, though recent studies (including the 2026 Nature work on tracheoles) indicate oxygen was not the sole factor enabling gigantism.<\/p>\n\n\n\n

These are the classic examples of Carboniferous gigantism:<\/strong><\/p>\n\n\n\n

Griffinflies (order Meganisoptera\/Protodonata):<\/strong> Meganeura monyi (wingspan ~65- 75 cm) and the related Meganeuropsis permiana (up to ~71 cm wingspan). These dragonfly- like aerial predators were among the largest flying insects ever. Other large Paleodictyoptera and mayfly- like insects also reached substantial sizes (wingspans up to ~45 cm in some cases).<\/p>\n\n\n\n

Arthropleura (especially Arthropleura armata and related forms):<\/strong> The largest- known land arthropod, a millipede- like myriapod reaching 2- 2.7+ meters in length and weighing up to ~50 kg. It was a detritivore or herbivore that roamed forests and open woodlands.<\/p>\n\n\n\n

Giant scorpions:<\/strong> Pulmonoscorpius kirktonensis (up to ~70 cm long), one of the largest terrestrial scorpions known, from early Carboniferous deposits in Scotland. It was likely an active predator.<\/p>\n\n\n\n

Other large arthropods included various cockroaches (blattopterans), spiders, and additional myriapods and arachnids that reached sizes uncommon today.<\/p>\n\n\n\n

Early tetrapods (amphibian-grade and the first amniotes) also lived under these conditions and sometimes attained large sizes:<\/p>\n\n\n\n

    \n
  • Temnospondyl and other labyrinthodont amphibians (e.g., forms related to Eryops later, or various Carboniferous genera), some reached lengths of 1- 2 and more meters and were dominant predators in wetlands.<\/li>\n\n\n\n
  • Early amniotes (stem reptiles and synapsids), such as Hylonomus (one of the earliest known reptiles) and other small- to- medium forms that began diversifying toward the end of the period. These were better adapted to drier conditions after events like the Carboniferous Rainforest Collapse.<\/li>\n<\/ul>\n\n\n\n

    Countless smaller insects, myriapods, arachnids, early tetrapods, fish (including sharks like Cladoselache), and of course the dominant plants (giant lycopsids such as Lepidodendron, sphenopsids, ferns, and seed ferns) also inhabited this high- O\u2082 world. <\/p>\n\n\n\n

    The combination of high oxygen, dense vegetation, humid wetlands, and the absence of large aerial vertebrate predators (birds and pterosaurs evolved much later) created ecological opportunities for arthropod gigantism.<\/p>\n\n\n\n

    Note that not all Carboniferous species were giants, most insects and other animals were of more ordinary sizes, and some large forms persisted into the Permian even as oxygen levels fluctuated.<\/p>\n\n\n\n

    The high- O\u2082 environment is one key part of the story of Carboniferous life, alongside climate, habitat structure, and evolutionary opportunity.<\/strong><\/p>\n\n\n\n

    \"A
    AI generated by Grok<\/figcaption><\/figure>\n\n\n\n

    The Carboniferous Period (\u2248359- 299 million years ago) featured one of Earth\u2019s most extreme and dynamic climate regimes: a prolonged icehouse (the Late Paleozoic Ice Age, or LPIA) with repeated glacial- interglacial cycles, very low atmospheric CO\u2082, rising O\u2082, extensive tropical coal forests, and progressive aridification toward the Permian.<\/strong><\/p>\n\n\n\n

    This interval spans the Mississippian (Early Carboniferous) and Pennsylvanian (Late Carboniferous) and is critical for understanding icehouse dynamics, carbon- cycle feedback involving early forests, and the conditions that supported giant insects such as Meganeura.<\/p>\n\n\n\n

    Atmospheric Composition<\/strong><\/p>\n\n\n\n

    CO\u2082: Dropped sharply from higher Devonian levels.<\/strong> During much of the LPIA, values were often in the range of ~200- 400 ppm (sometimes as low as ~150- 200 ppm or lower in models and proxies), among the lowest of the Phanerozoic. High- resolution records show orbital- scale (eccentricity) fluctuations of hundreds of ppm. A rapid ~4- fold rise around 294 Ma (Early Permian) helped end the main phase of the ice age.<\/p>\n\n\n\n

    O\u2082: Rose substantially due to massive organic- carbon burial in coal swamps<\/strong> (incomplete decomposition under waterlogged, anoxic conditions). Estimates commonly reach ~25- 35% by the late Carboniferous\/early Permian (versus ~21% today). This high- O\u2082 atmosphere is linked to the earlier discussion of giant insects, though the 2026 study indicates it was not the sole size constraint.<\/p>\n\n\n\n

    Low CO\u2082 reduced the greenhouse effect, while high O\u2082 and widespread vegetation burial reinforced cooling. Modeling shows that CO\u2082 levels near the lower end approached thresholds that could have risked more extreme (near- Snowball) glaciation, though orbital variations and other factors prevented it.<\/p>\n\n\n\n

    The Late Paleozoic Ice Age (LPIA)<\/strong><\/p>\n\n\n\n

    The LPIA is the longest- lived and one of the most intense icehouses of the Phanerozoic (roughly Late Devonian to mid\/late Permian, with its Carboniferous peak).<\/p>\n\n\n\n

      \n
    • Glaciation <\/strong>intensified from the late Visean\/Serpukhovian onward, with multiple discrete glacial episodes separated by interglacials.<\/li>\n\n\n\n
    • Ice centers<\/strong> were concentrated on southern Gondwana (South America, Africa, Antarctica, Australia, India), expanding and contracting; maximum extent occurred near the Carboniferous- Permian boundary.<\/li>\n\n\n\n
    • Sea- level fluctuations <\/strong>of tens to ~100 m produced widespread cyclothems (repeating sequences of marine, terrestrial, and coal deposits) driven by glacioeustasy, paced by orbital cycles (especially 405- kyr eccentricity and longer obliquity modulations). <\/li>\n\n\n\n
    • Global average temperatures <\/strong>during glacial maxima were cooler than today<\/strong> in many reconstructions (tropics still relatively warm but with strong gradients; polar regions very cold).<\/li>\n<\/ul>\n\n\n\n

      The main icehouse phase was maintained by sustained low CO\u2082. Deglaciation accelerated in the Early Permian with the CO\u2082 rise, leading to warmer, drier conditions overall.<\/p>\n\n\n\n

      Tropical Forests, Coal, and Climate Feedback<\/strong><\/p>\n\n\n\n

      Equatorial regions (Laurussia\/Euramerica) hosted vast wetland \u201ccoal forests\u201d <\/strong>dominated by lycopsids (giant clubmosses such as Lepidodendron), sphenopsids (horsetails), ferns, and early seed plants. These created the bulk of the world\u2019s coal deposits through rapid peat accumulation.<\/p>\n\n\n\n

      Vegetation was highly dynamic:<\/p>\n\n\n\n

        \n
      • Repeated turnovers between wetland<\/strong> (humid, glacial-linked) and dryland<\/strong> (more seasonal or arid) biomes on glacial- interglacial timescales.<\/li>\n\n\n\n
      • The Carboniferous Rainforest Collapse<\/strong> (around the late Moscovian\/Kasimovian, ~305- 307 Ma) involved contraction of the lycopsid- dominated wetlands, linked to cooling, drying, sea- level fall, and habitat fragmentation. This reduced a major carbon sink and contributed to later CO\u2082 changes.<\/li>\n<\/ul>\n\n\n\n

        Plant physiology (stomatal conductance, water use) and ecosystem shifts influenced local hydrology, runoff, and the broader carbon cycle, creating feedbacks with climate.<\/p>\n\n\n\n

        Broader Dynamics and Drivers<\/strong><\/p>\n\n\n\n

        Paleogeography:<\/strong> Assembly of Pangaea increased continentality, altered ocean circulation, and contributed to progressive tropical aridification (especially across the Carboniferous- Permian transition). Mountain building (e.g., Central Pangaean Mountains) affected regional rainfall and weathering.<\/p>\n\n\n\n

        Orbital forcing:<\/strong> Strong eccentricity and obliquity signals drove the high- frequency glacial- interglacial cycles and associated sea- level, vegetation, and CO\u2082 variations.<\/p>\n\n\n\n

        Long- term trend: <\/strong>Overall cooling into the LPIA<\/strong> apex, followed by aridification and warming into the Permian. Equatorial Pangaea shifted from persistently humid wetlands toward more seasonal and eventually semi- arid\/arid conditions.<\/p>\n\n\n\n

        These dynamics created a world of high oxygen, expansive wetlands (favoring large arthropods), fluctuating sea levels, and strong latitudinal climate gradients, very different from both the preceding Devonian greenhouse and the subsequent Permian. The Carboniferous remains a key analog for understanding icehouse carbon- cycle\u2013 climate interactions on a vegetated Earth.<\/strong><\/p>\n\n\n\n

        __________________________________________________________<\/p>\n\n\n\n

        Carboniferous climate (\u2248359- 299 Ma) was defined by the Late Paleozoic Ice Age (LPIA), a prolonged icehouse with repeated glacial- interglacial cycles, low atmospheric CO\u2082 (often 200- 400 ppm or lower), rising O\u2082 (peaking ~25\u201335%), humid equatorial wetlands, and progressive tropical aridification.<\/strong><\/p>\n\n\n\n

        These conditions produced cascading impacts across the atmosphere, biosphere, geology, and long- term Earth systems.<\/p>\n\n\n\n

        Widespread tropical forests (especially lycopsid-dominated coal swamps) drove massive organic- carbon burial. <\/p>\n\n\n\n

        This drew down CO\u2082, reinforcing global cooling and sustaining the LPIA, while elevating O\u2082 through photosynthesis and incomplete decay under waterlogged conditions. High burial rates brought CO\u2082 close to thresholds that risked more extreme (near- Snowball Earth) glaciation<\/strong>, though orbital variations and other factors prevented total freeze- over.<\/p>\n\n\n\n

        The high- O\u2082 atmosphere promoted more frequent and intense wildfires (evident in abundant charcoal)<\/strong>, altering vegetation structure and nutrient cycling. Plant physiology was also affected: elevated O\u2082 relative to CO\u2082 increased photorespiration in C3 plants, potentially reducing net primary productivity in some models, while still supporting vast biomass overall.<\/p>\n\n\n\n

        Vegetation and forests:<\/strong> Oscillating glacial- interglacial climates repeatedly restructured tropical forests between everwet swamp biomes (glacial phases) and more seasonal\/dryland communities (interglacials). This culminated in the Carboniferous Rainforest Collapse (~305 Ma)<\/strong>, which fragmented and largely eliminated the classic lycopsid coal forests in Euramerica, shifting dominance to tree ferns and more drought-tolerant groups. Habitat loss reduced a major carbon sink and contributed to later aridification.<\/p>\n\n\n\n

        Arthropods:<\/strong> High oxygen relaxed respiratory constraints for tracheal breathers, facilitating gigantism in forms such as the griffinfly Meganeura (wingspans ~70 cm)<\/strong>, the millipede- like Arthropleura (up to 2.5 and more meters), and large scorpions like Pulmonoscorpius.<\/strong> Dense vegetation and limited large vertebrate competitors further supported this. Flight evolved and diversified rapidly among insects.<\/p>\n\n\n\n

        Tetrapods:<\/strong> Wetland habitats favored amphibian- grade forms, but climate shifts (especially aridification and the rainforest collapse) drove extinctions among moisture- dependent amphibians while favoring the radiation of amniotes (early reptiles and synapsids) with adaptations for drier conditions (e.g., amniotic eggs). Habitat fragmentation promoted endemism, new ecological strategies (herbivory, predation), and broader terrestrial expansion.<\/p>\n\n\n\n

        Marine life experienced sea- level fluctuations (cyclothems from glacioeustasy of tens to ~100 m), anoxia in some intervals, and biodiversity responses tied to cooling versus warming pulses.<\/strong><\/p>\n\n\n\n

        Glacial cycles produced widespread cyclothems, repeating sedimentary sequences of marine limestones, shales, sandstones, and coals, that dominate Carboniferous strata in many regions. <\/p>\n\n\n\n

        Sea- level falls exposed vast lowlands for peat accumulation, later becoming the bulk of the world\u2019s economic coal deposits (the source of much of the fossil carbon driving modern industrial CO\u2082 emissions).<\/p>\n\n\n\n

        Mountain building associated with Pangaea assembly created rain shadows and altered drainage, contributing to regional drying. Polar ice sheets on Gondwana left glacial deposits (tillites, striations) across southern continents.<\/p>\n\n\n\n

        The Carboniferous set the stage for the early Permian transition to warmer, drier conditions as CO\u2082 eventually rose and ice sheets waned. <\/p>\n\n\n\n

        The period\u2019s icehouse dynamics, vegetation-climate feedback, and atmospheric extremes provide key analogs for understanding modern icehouse- greenhouse transitions, the role of forests as carbon sinks, and how climate stress drives evolutionary and ecosystem restructuring. <\/p>\n\n\n\n

        In short, Carboniferous climate not only shaped a unique world of giant arthropods and coal forests but left a lasting imprint on Earth\u2019s carbon cycle and biological trajectory.<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

        Many species thrived in the Carboniferous Period (\u2248359- 299 million years ago) under elevated atmospheric oxygen levels, estimated at roughly 25- 35% (versus ~21% today).<\/p>\n

        The Carboniferous Period (\u2248359- 299 million years ago) featured one of Earth\u2019s most extreme and dynamic climate regimes: a prolonged icehouse (the Late Paleozoic Ice Age, or LPIA) with repeated glacial- interglacial cycles, very low atmospheric CO\u2082, rising O\u2082, extensive tropical coal forests, and progressive aridification toward the Permian.<\/p>\n","protected":false},"author":121246920,"featured_media":469474,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","advanced_seo_description":"Explore how high atmospheric oxygen levels during the Carboniferous Period contributed to the rise of giant insects and lush rainforests.","jetpack_seo_html_title":"The Truth About Meganeura: Beyond Oxygen in Insect Gigantism","jetpack_seo_noindex":false,"jetpack_seo_schema_type":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_wpcom_ai_launchpad_first_post":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[1],"tags":[691845262,691845258,691829997,691845255,691845259,691845260,691845256,691845261,691845263,691845144,691845257],"class_list":["post-469473","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-arthropleura","tag-coal-forests","tag-carbon-dioxide-co","tag-carboniferous-period","tag-carboniferous-rainforest-collapse","tag-giant-scorpions","tag-glacial-interglacial-cycles","tag-griffinflies","tag-high-o-world","tag-late-paleozoic-ice-age","tag-oxygen-o","fallback-thumbnail"],"jetpack_publicize_connections":[],"jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/paxLW1-1Y89","jetpack-related-posts":[{"id":306700,"url":"https:\/\/climatescience.press\/?p=306700","url_meta":{"origin":469473,"position":0},"title":"How CO2 starvation Caused the Greatest Extinction Event","author":"uwe.roland.gross","date":"03\/09\/2024","format":false,"excerpt":"Around 400 million years ago during the Devonian, carbon dioxide concentrations were over 2000 ppm, 5 times higher than today\u2019s level. 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