") no-repeat center center;background-size:10px 16px;content:' '}@media(min-width:768px){.UeJNJ::before{display:none}}.cPCVUJ{min-height:389px;margin-bottom:16px;clear:both}@media(min-width:1000px){.cPCVUJ{min-height:380px}}.rAFIl{width:100%;box-sizing:border-box}@media(min-width:768px){.rAFIl{max-width:634px}}@media(min-width:1250px){.rAFIl{max-width:622px}}.dsXGM{display:flex;width:auto;box-sizing:border-box;align-items:center;justify-content:flex-start;gap:4px;color:#0074bd;color:light-dark(#0074bd,#0074bd)}.jrwZqm{display:block;font:bold 14px/20px 'Indy Sans','Indy Sans Fallback',sans-serif;text-decoration-line:underline;margin-block:0;text-align:center}.jLycBr{display:inline-flex;align-items:center;justify-content:center;gap:4px}.jLycBr:hover .sc-aja53j-2,.jLycBr:hover .sc-a5wy94-0{color:#005c97;color:light-dark(#005c97,#99c7e4)}.lcJUSj{font:normal 16px/20px 'Indy Sans','Indy Sans Fallback',sans-serif}.hJPJVF{display:flex;position:relative;overflow:hidden;width:auto;height:40px;flex-direction:column;order:-1;gap:8px;opacity:1;transition:all .5s ease-in-out;transition-behavior:allow-discrete}.hJPJVF::after{--fade-from:rgba(255,255,255,0);--fade-mid:rgba(255,255,255,0.5);--fade-to:#fff;position:absolute;bottom:0;left:0;z-index:1;width:100%;height:40px;background-image:linear-gradient(to bottom,var(--fade-from) 0,var(--fade-mid) 50%,var(--fade-to) 100%);content:'';opacity:1;pointer-events:none;transition:opacity 150ms ease-out}@supports(color:light-dark(red,red)){.hJPJVF::after{--fade-from:light-dark(rgba(255,255,255,0),rgba(0,0,0,0))}}@supports(color:light-dark(red,red)){.hJPJVF::after{--fade-mid:light-dark(rgba(255,255,255,0.5),rgba(0,0,0,0.5))}}@supports(color:light-dark(red,red)){.hJPJVF::after{--fade-to:light-dark(#fff,#000)}}@media(min-width:768px){.PdmgT{order:-1}}@media(min-width:768px){.eMEmGu{display:flex;position:relative;align-items:flex-start;margin-top:12px}}@media(min-width:1000px){.lfyduH .taboola{display:none}}.lfyduH:has(#taboola-carousel-thumbnails){min-height:426px}.lfyduH:has(#taboola-mid-article-thumbnails-crime){min-height:405px}@media(min-width:1000px){.lfyduH:has(#taboola-carousel-thumbnails),.lfyduH:has(#taboola-mid-article-thumbnails-crime){min-height:0}}.iUtUOL .tp-container-inner,.iUtUOL .sc-1suqprf-0{position:relative;box-shadow:0 -22px 16px 22px rgba(255,255,255,0.95);box-shadow:0 -22px 16px 22px light-dark(rgba(255,255,255,0.95),rgba(0,0,0,0.95))}.iUtUOL.closed{display:none}.dOsHXs{display:block;margin:0 0 16px;color:inherit;text-decoration:underline}.hrkFLt{width:32px}.hrkFLt,.hrkFLt:focus{color:#0074bd;color:light-dark(#0074bd,#4c9dd0)}.hrkFLt:hover,.hrkFLt:active,.hrkFLt:focus-visible{color:#005c97;color:light-dark(#005c97,#99c7e4)}@media(min-width:768px){.hrkFLt.mobile-only{display:none}}.dzqQwN{display:flex;gap:12px}.dFzDMM .sc-17yxc4y-0{display:none}.dFzDMM:hover .sc-17yxc4y-0,.dFzDMM.bookmark-button-saved .sc-17yxc4y-0{display:block}.dFzDMM:hover .sc-17yxc4y-1,.dFzDMM.bookmark-button-saved .sc-17yxc4y-1{display:none}.dFzDMM.bookmark-button-saved .sc-17yxc4y-0{display:block}.dFzDMM.bookmark-button-saved .sc-17yxc4y-1{display:none}.dFzDMM.bookmark-button-saved:hover .sc-17yxc4y-0{display:none}.dFzDMM.bookmark-button-saved:hover .sc-17yxc4y-1{display:block}.lfNyeg{display:inline-block;width:32px;height:32px;color:#337e81;color:light-dark(#337e81,#70a5a7)}.sQzGY{display:flex;flex-direction:row;justify-content:center;gap:12px}.cNueyK{display:flex;position:relative;justify-content:center}@media(min-width:768px){.cNueyK{justify-content:flex-end;padding-top:12px;margin:0}}.dUmHef{display:flex}.sticky .dUmHef{flex-direction:column}.igSthU{overflow:hidden;height:23px;margin-bottom:8px;border-bottom:0;clear:both}@media(min-width:768px){.igSthU{height:25px}}.fvIzys{display:inline-block;flex-shrink:0;margin:0 12px 0 0;font:bold 14px/normal 'Indy Sans','Indy Sans Fallback',sans-serif}.fvIzys::after{content:':'}.knjHva{display:inline-block;margin-right:12px;margin-bottom:4px;color:#222;color:light-dark(#222,#fff);font:normal 14px/1.29 'Indy Sans','Indy Sans Fallback',sans-serif;text-decoration:underline}.knjHva::first-letter {text-transform:capitalize}@media(min-width:1000px){.subscribed .lgqZRU{margin-top:-184px}.article-feature:not(.article-feature-video) .subscribed .lgqZRU{margin-top:-407px}}.lgqZRU>p{margin:16px 0}.article-premium .lgqZRU>p{line-height:27px}.lgqZRU>h2{font-size:21px}.article-climate .lgqZRU>h2{color:#0074bd;color:light-dark(#0074bd,#0074bd)}.article-sgi .lgqZRU>h2{color:#0074bd;color:light-dark(#0074bd,#0074bd)}.lgqZRU>p:first-child{margin-top:0}.lgqZRU span:first-child~p:first-of-type{margin-top:0}.FtcnY{display:flex;position:relative;max-width:100%;min-height:600px;justify-content:center;margin:0 auto;background-color:transparent;clear:both}@media(min-width:1000px){.FtcnY{min-height:450px}}.teads .FtcnY{display:block}.FtcnY [data-mpu]{position:sticky;top:16px}@media(min-width:1000px){.cCcguK{display:none}}.cCcguK[data-mpu1]{min-height:600px}.cCcguK.pb-20{padding-bottom:20px}.dFpFuY{overflow:hidden;width:100%;box-sizing:border-box;margin-bottom:16px}@media(min-width:768px){.dFpFuY{max-width:634px}}@media(min-width:1250px){.dFpFuY{max-width:622px}}.hqmDPG{width:100%;box-sizing:border-box;padding:8px 12px 12px;border-top:8px solid #0074bd;border-top:8px solid light-dark(#0074bd,#0074bd);background-color:#e5f1f8;background-color:light-dark(#e5f1f8,#005184)}@media(min-width:768px){.hqmDPG{padding-top:4px;padding-bottom:12px}}.fXvmgM{font:bold 22px/26px 'Indy Serif','Indy Serif Fallback',serif;margin:0 0 12px;text-align:center}@media(min-width:768px){.fXvmgM{font:bold 30px/34px 'Indy Serif','Indy Serif Fallback',serif;letter-spacing:-0.048px;margin-bottom:12px;text-align:left}}.ivTlwT{display:block;margin-bottom:12px}@media(min-width:768px){.ivTlwT{display:none}}.eJqCeI{display:flex;width:100%;box-sizing:border-box;align-items:center;justify-content:center;gap:4px;background-color:#e5f1f8;background-color:light-dark(#e5f1f8,#005184);color:#0074bd;color:light-dark(#0074bd,#0074bd)}@media(min-width:768px){.eJqCeI{width:auto;justify-content:flex-start}}.dAuNha{display:block;font:bold 14px/20px 'Indy Sans','Indy Sans Fallback',sans-serif;text-decoration-line:underline;margin-block:0;text-align:center}.cAWFXR{display:inline-flex;align-items:center;justify-content:center;gap:4px}.cAWFXR:hover .sc-hez36s-5,.cAWFXR:hover .sc-a5wy94-0{color:#005c97;color:light-dark(#005c97,#99c7e4)}.laZbyn{font:normal 16px/20px 'Indy Sans','Indy Sans Fallback',sans-serif}.juUDRT{display:flex;width:100%;flex-direction:column}@media(min-width:768px){.juUDRT{display:flow-root;gap:24px;transition:margin-bottom .3s ease-in-out}}.kRWakq{display:flex;width:100%;flex-direction:column;align-items:center;justify-content:center}@media(min-width:768px){.kRWakq{position:relative;z-index:1;width:212px;flex-shrink:0;justify-content:flex-start;margin-left:24px;float:right}}.eJjJXF{display:none;flex-direction:row;align-items:center;justify-content:center;gap:8px;margin-top:8px}@media(min-width:768px){.eJjJXF{display:flex;margin-top:12px}}.dLfZIO{display:flex;width:100%;align-items:center;justify-content:center;gap:8px;margin-top:8px;margin-bottom:12px}@media(min-width:768px){.dLfZIO{display:none}}@media(min-width:768px){.cqPbFA{order:-1}}.jIwQBP .sc-aja53j-5::after{--fade-from:rgba(229,241,248,0);--fade-mid:rgba(229,241,248,0.5);--fade-to:#e5f1f8}@media(min-width:360px){.jIwQBP .sc-aja53j-5 .sc-aja53j-7{display:none}}@supports(color:light-dark(red,red)){.jIwQBP .sc-aja53j-5::after{--fade-from:light-dark(rgba(229,241,248,0),rgba(0,81,132,0))}}@supports(color:light-dark(red,red)){.jIwQBP .sc-aja53j-5::after{--fade-mid:light-dark(rgba(229,241,248,0.5),rgba(0,81,132,0.5))}}@supports(color:light-dark(red,red)){.jIwQBP .sc-aja53j-5::after{--fade-to:light-dark(#e5f1f8,#005184)}}.cKWiEj{margin:0 0 24px;font:normal 16px/20px 'Indy Sans','Indy Sans Fallback',sans-serif}.huxBsk{font:bold 16px/20px 'Indy Sans','Indy Sans Fallback',sans-serif}.jaiOuh{display:flex;min-height:600px;justify-content:center}@media(min-width:1000px){.jaiOuh{min-height:450px}}.jasvOK{min-height:600px}@media(min-width:1000px){.jasvOK{min-height:450px}}.jasvOK.mobile-only{display:block}@media(min-width:1000px){.jasvOK.mobile-only{display:none}}.jasvOK.desktop-only{display:none}@media(min-width:1000px){.jasvOK.desktop-only{display:block;margin-bottom:16px}}.jasvOK.desktop-only+p{margin-top:0}.jasvOK .third-party-ad{position:sticky;top:16px}.bYBoJE{width:100%;flex-grow:1}.bYBoJE .social-share{width:100%;padding-top:10px;padding-bottom:20px}@media(min-width:768px){.bYBoJE .social-share{justify-content:flex-start}}.bYBoJE .social-share.sticky{display:none}@media(min-width:1000px){.bYBoJE .social-share.sticky{display:flex;position:sticky;top:14px;width:34px;flex-direction:column;padding-top:0;margin-top:0;margin-left:-25%}.bYBoJE .social-share.sticky .sc-mgcah7-0{margin:0 0 16px}.article-feature-video .bYBoJE .social-share.sticky{margin-top:0}.article-feature:not(.article-feature-video) .bYBoJE .social-share.sticky{margin-top:35%}}.bYBoJE.sponsored-article img,.bYBoJE.sponsored-article video{width:100%;max-width:602px;height:auto}.bYBoJE.sponsored-article iframe{max-width:602px;max-height:400px}.bYBoJE .under-article-prompt-donations{padding-bottom:8px;margin-top:-3px}.bYBoJE .big-letter{--color:#222;display:flex;position:relative;width:0;height:0;align-items:center;justify-content:center;padding:40px;margin-top:22px;margin-right:12px;border:1px solid var(--color);float:left;font:normal 52px/1 'Indy Serif','Indy Serif Fallback',serif;text-transform:uppercase}.bYBoJE .big-letter:first-child{margin-top:6px}.bYBoJE .big-letter::before{position:absolute;top:0;left:0;width:100%;height:100%;box-sizing:border-box;border:1px solid var(--color);border-radius:50%;content:''}.bYBoJE #taboola-below-article-1{min-height:2350px}@media(min-width:768px){.bYBoJE #taboola-below-article-1{min-height:3370px}}.bYBoJE #taboola-below-article-1-split-num-1{min-height:130px}@media(min-width:768px){.bYBoJE #taboola-below-article-1-split-num-1{min-height:415px}}.bYBoJE .sc-fwko30-0+.sc-1xtsh2b-0{margin-top:-16px}@media(min-width:768px){.bYBoJE{max-width:636px;margin:0}}@media(min-width:1000px){.bYBoJE{max-width:624px;margin:0}.bYBoJE.subscribed{max-width:636px}}@media(max-width:999px){.bYBoJE{padding-right:0}.bYBoJE .under-article-prompt-donations{margin-top:-18px}}.bYBoJE .anchor-nav-header{scroll-margin-top:79px}.bYBoJE .anchor-nav-header a{color:#222;color:light-dark(#222,#fff)}.bYBoJE .anchor-nav-header a:hover{color:#222;color:light-dark(#222,#fff)}@supports(color:light-dark(red,red)){.bYBoJE .big-letter{--color:light-dark(#222,#fff)}}.jYgehE{display:flex;flex-wrap:wrap;justify-content:flex-start;margin-bottom:8px;color:#646464;color:light-dark(#646464,#bdbdbd);font:normal 16px/20px 'Indy Sans','Indy Sans Fallback',sans-serif}@media(min-width:768px){.jYgehE{width:70%;align-items:center;justify-content:flex-start;margin-bottom:0;font:normal 16px/24px 'Indy Sans','Indy Sans Fallback',sans-serif}}@media(min-width:1000px){.jYgehE{width:70%;margin-bottom:0}}.dMNxBE{display:flex;height:20px;margin:0 12px 8px 0}.article-voices .dMNxBE{height:auto}@media(min-width:425px){.article-voices .dMNxBE{height:20px}}.dMNxBE::before{display:inline-block;align-self:center;margin-top:1px;margin-right:12px;content:'\2022';transform:scale(1.5)}.dMNxBE:first-child::before{content:none}@media(min-width:768px){.dMNxBE{height:24px;margin-bottom:0}.dMNxBE::before{margin-top:2px}}.dMNxBE time{display:block}.dMNxBE time::first-letter {text-transform:capitalize}.jphIe{display:inline-block;margin:0 12px 8px 0;color:#0074bd;color:light-dark(#0074bd,#4c9dd0);font:bold 16px/20px 'Indy Sans','Indy Sans Fallback',sans-serif;letter-spacing:-0.5px}.jphIe:hover,.jphIe:active{color:#005c97;color:light-dark(#005c97,#99c7e4)}@media(min-width:768px){.jphIe{margin-bottom:0}}.ePBJFt{margin:0 12px 8px -8px}@media(min-width:768px){.ePBJFt{margin-bottom:0}}.oMeFT{margin:0 4px 8px 0}.oMeFT::before{display:inline-block;margin-top:2px;margin-right:12px;color:#646464;color:light-dark(#646464,#bdbdbd);content:'\2022';transform:scale(1.5)}.oMeFT:first-child::before{display:none}@media(min-width:768px){.oMeFT{margin-bottom:0}}.bMRmfY{display:flex;justify-content:flex-start;padding:0;margin:0 0 16px}@media(min-width:768px){.bMRmfY{display:flex;width:30%;align-items:center;justify-content:flex-end;margin:0}}@media(min-width:1000px){.bMRmfY{width:30%}}.dfBarH{padding-top:0;border-top:0;border-bottom:0}@media(min-width:768px){.dfBarH{display:flex;flex-flow:row wrap;padding-bottom:16px}.dfBarH .sc-mzrbq8-0{order:1}.dfBarH .sc-mzrbq8-6{order:2}}@media(min-width:1000px){.dfBarH{flex-direction:row}}.cQzzmB{padding:16px 12px 12px;text-align:left;font:bold 14px/18px 'Indy Sans','Indy Sans Fallback',sans-serif}@media(min-width:768px){.cQzzmB{padding:16px 16px 12px}}.article-infact .cQzzmB{padding:16px 0}@media(min-width:1000px){.cQzzmB{padding:24px 0 19px}.article-feature .cQzzmB{max-width:968px;margin:0 auto}}.cQzzmB a{color:#222;color:light-dark(#222,#fff)}.cQzzmB a:hover{color:#005c97;color:light-dark(#005c97,#99c7e4)}.cQzzmB a:hover::after{color:#222;color:light-dark(#222,#fff)}.cQzzmB a::after{margin-right:4px;margin-left:4px;content:'>'}.cQzzmB a:last-child::after{display:none}.gbPKFW{margin:0 0 20px;letter-spacing:0}.drRZfZ{margin:0;color:#646464;color:light-dark(#646464,#bdbdbd);font:normal 16px/20px 'Indy Sans','Indy Sans Fallback',sans-serif}@media(min-width:768px){.drRZfZ{font:normal 18px/22px 'Indy Sans','Indy Sans Fallback',sans-serif}}@media(min-width:1000px){.drRZfZ{font:normal 20px/24px 'Indy Sans','Indy Sans Fallback',sans-serif}}.drRZfZ p{font:inherit}.article-feature .drRZfZ a{font-weight:bold}.hYTnrH{max-width:968px;margin:0 auto;background:#fff;background:light-dark(#fff,#000)}@media(min-width:1000px){.hYTnrH{padding:0 16px}.parallax .hYTnrH{max-width:1240px}}.fdtMsm{font:bold 32px/36px 'Indy Serif','Indy Serif Fallback',serif;letter-spacing:-0.0156em}@media(min-width:768px){.fdtMsm{font:bold 44px/48px 'Indy Serif','Indy Serif Fallback',serif;letter-spacing:-0.0113em}}@media(min-width:1000px){.fdtMsm{font:bold 54px/58px 'Indy Serif','Indy Serif Fallback',serif;letter-spacing:-0.0092em}}.kZQexU .sc-qvufca-0{margin:0 12px}@media(min-width:768px){.kZQexU .sc-qvufca-0{max-width:968px;margin-right:16px;margin-left:16px}}@media(min-width:1000px){.kZQexU .sc-qvufca-0{margin-right:auto;margin-left:auto}}.kZQexU .sc-qvufca-2{margin-bottom:16px;color:#222;color:light-dark(#222,#fff)}@media(min-width:768px){.kZQexU .sc-qvufca-2{margin-bottom:18px}}@media(min-width:1000px){.kZQexU .sc-qvufca-2{margin-top:0}}.article-feature .kZQexU .sc-qvufca-2{text-align:center}@media(min-width:1000px){.article-feature .kZQexU .sc-qvufca-2{max-width:968px}}.kZQexU .sc-1cmj4ml-0{margin-bottom:16px}@media(min-width:1000px){.kZQexU .sc-1cmj4ml-0{max-width:968px}}.kZQexU .sc-1cmj4ml-0 p{margin-top:0}@media(min-width:768px){.kZQexU .sc-1cmj4ml-0 p{margin-bottom:16px}}@media(min-width:2560px){.kZQexU .sc-1cmj4ml-0 p{margin-bottom:12px}}.fzuCgM{overflow:hidden;height:0;color:transparent}.fmcHss{max-width:100%;margin:0 0 20px}.fmcHss.sticky{position:sticky;top:16px}.hlxBlR{min-height:600px}.hlxBlR #mpu1,.hlxBlR #sidebar1{position:sticky;top:16px}.MxpAk{min-height:250px}.clQXMC{max-width:100%}.eEtnsS{margin:0 0 6px;color:#646464;color:light-dark(#646464,#bdbdbd);font-family:'Indy Sans','Indy Sans Fallback',sans-serif;font-size:15px}.PbXHI{margin:0 0 12px}.hVucHy{height:380px}.pAheK{width:100%;height:51px}.lgmjvx{margin-bottom:16px;border-bottom:1px solid #919191;border-bottom:1px solid light-dark(#919191,#646464)}.gSAEA-d{margin-bottom:16px}.gSAEA-d [role='listitem']{position:relative;margin-bottom:12px;border-bottom:1px solid #d3d3d3;border-bottom:1px solid light-dark(#d3d3d3,#919191)}.gSAEA-d [role='listitem'] .sc-u4n1j-0{display:flex;position:absolute;bottom:16px;left:10px;width:32px;height:32px;align-items:center;justify-content:center;border-radius:50%;background-color:#ec1a2e;background-color:light-dark(#ec1a2e,#ec1a2e)}.gSAEA-d [role='listitem'] .sc-u4n1j-0>svg{width:90%;fill:#fff;fill:light-dark(#fff,#000);stroke:transparent}.gSAEA-d [role='listitem']:first-child{display:block;padding-bottom:0;margin-bottom:12px}.gSAEA-d [role='listitem']:first-child .sc-u4n1j-0{top:-15px;bottom:auto;left:12px}.gSAEA-d [role='listitem']:first-child>*:first-child{display:block;width:100%;height:205px}.gSAEA-d [role='listitem']:first-child>*:last-child{--content-bg:#222;--content-bg-opaque:rgba(34,34,34,0.7);position:absolute;bottom:0;width:100%;padding:28px 12px 12px;background:linear-gradient(to top,var(--content-bg) 70%,var(--content-bg-opaque) 100%) no-repeat;color:#fff;color:light-dark(#fff,#222);font-size:17px;font-weight:bold}.gSAEA-d [role='listitem']:last-child{margin-bottom:0;border-bottom:0 none}@supports(color:light-dark(red,red)){.gSAEA-d [role='listitem']:first-child>*:last-child{--content-bg:light-dark(#222,#222)}}@supports(color:light-dark(red,red)){.gSAEA-d [role='listitem']:first-child>*:last-child{--content-bg-opaque:light-dark(rgba(34,34,34,0.7),rgba(34,34,34,0.7))}}.fgtiQY{min-height:1924px}@media(max-width:767px){.fgtiQY{display:none}}.eqQkhO{width:308px}.eqQkhO.hidden{display:none}@media(max-width:999px){.eqQkhO{display:none}}.article-liveblog .dzfINj{background-color:#f7f7f7;background-color:light-dark(#f7f7f7,#222)}.jBkNwU{justify-content:center}.cumEve{justify-content:center}
Stay up to date with notifications from The Independent Notifications can be managed in browser preferences.
Not now Yes please
Climate News Mammoths driven to extinction because of climate change - not human hunters, study says Ground-breaking study suggests climate change made it too wet for the giant animals to survive
Harry Cockburn Environment Correspondent
Wednesday 20 October 2021 20:07 BST
The rapidity of the changes to tundra landscapes left mammoths with little to eat, new research reveals (Daniel Eskridge) Leer en Español Your support helps us to tell the story From reproductive rights to climate change to Big Tech, The Independent is on the ground when the story is developing. Whether it's investigating the financials of Elon Musk's pro-Trump PAC or producing our latest documentary, 'The A Word', which shines a light on the American women fighting for reproductive rights, we know how important it is to parse out the facts from the messaging.
At such a critical moment in US history, we need reporters on the ground. Your donation allows us to keep sending journalists to speak to both sides of the story.
The Independent is trusted by Americans across the entire political spectrum. And unlike many other quality news outlets, we choose not to lock Americans out of our reporting and analysis with paywalls. We believe quality journalism should be available to everyone, paid for by those who can afford it.
Your support makes all the difference. Read more For around five million years, various species of mammoth walked the Earth, and lived across Africa, Asia, Europe, and the Americas.
The last species to emerge – the shaggy-coated woolly mammoth – evolved in East Asia around 600,000 years ago and survived until the last one died out on Russia’s Wrangel Island, in the Arctic Ocean until as recently as 4,000 years ago.
But was it humans that were responsible for their demise? Or was it something else?
It is known that for millennia, humans and mammoths coexisted: people drew pictures of mammoths on cave walls 30,000 years ago.
Humans also hunted mammoths, using their skeletons to build shelters, their tusks to carve harpoons; the world’s oldest-known musical instrument is a flute carved out of mammoth bone.
But now new research suggests that it wasn’t human pressures that ultimately drove mammoths to extinction, but instead ancient changes to the climate that made it too wet for them to survive.
In a groundbreaking 10-year-long research project, geneticists from the University of Cambridge and the University of Copenhagen analysed ancient environmental DNA and say they have proved mammoths were pushed to extinction because of a warming climate.
They say that when the ice receded following the last ice age, a rapid transformation of the climate made it too wet to sustain the level of vegetation the giant animals needed to survive.
The team used a technique called “DNA shotgun sequencing” to analyse environmental plant and animal remains – including urine, faeces and skin cells – taken from soil samples carefully collected over a period of 20 years from sites in the Arctic where mammoth remains were found.
This new technique – similar to the methods used during the Covid pandemic to test sewage to analyse the spread of the virus – means scientists no longer have to rely on DNA samples from bones or teeth and hope to gather enough genetic material to recreate a profile of ancient DNA.
Professor Eske Willerslev from St John’s College, Cambridge, said: “Scientists have argued for 100 years about why mammoths went extinct. Humans have been blamed because the animals had survived for millions of years without climate change killing them off before, but when they lived alongside humans they didn’t last long and we were accused of hunting them to death.
“We have finally been able to prove that it was not just the climate changing that was the problem, but the speed of it that was the final nail in the coffin – they were not able to adapt quickly enough when the landscape dramatically transformed and their food became scarce.”
He added: “As the climate warmed up, trees and wetland plants took over and replaced the mammoth’s grassland habitats. And we should remember that there were a lot of animals around that were easier to hunt than a giant woolly mammoth – they could grow to the height of a double-decker bus.”
Despite the harsh conditions in which they lived, the animals would have thrived. Alongside woolly mammoths, herds of reindeer and woolly rhinoceroses would also have lived, all sustained on the abundant vegetation which included grasses, flowers, plants, and small shrubs. These would all have been eaten by the vegetarian mammoths who probably used their tusks to shovel snow aside before uprooting tough grasses.
Dr Yucheng Wang, first author of the paper and a Research Associate at the Department of Zoology, University of Cambridge, said: “The most recent Ice Age – called the Pleistocene – ended 12,000 years ago when the glaciers began to melt and the roaming range of the herds of mammoths decreased.
“It was thought that mammoths began to go extinct then but we also found they actually survived beyond the Ice Age all in different regions of the Arctic and into the Holocene – the time that we are currently living in – far longer than scientists realised.
“We zoomed into the intricate detail of the environmental DNA and mapped out the population spread of these mammals and show how it becomes smaller and smaller and their genetic diversity gets smaller and smaller too, which made it even harder for them to survive.”
He added: “When the climate got wetter and the ice began to melt it led to the formation of lakes, rivers, and marshes. The ecosystem changed and the biomass of the vegetation reduced and would not have been able to sustain the herds of mammoths.
“We have shown that climate change, specifically precipitation, directly drives the change in the vegetation – humans had no impact on them at all based on our models.”
With the current climate crisis worsening due to anthropogenic emissions, while humans may not have been to blame in the past, we are already contributing to a major extinction event now.
Professor Willerslev said the speed of the changes which affected the mammoths was “a stark lesson from history and shows how unpredictable climate change is”.
“Once something is lost, there is no going back. Precipitation was the cause of the extinction of woolly mammoths through the changes to plants. The change happened so quickly that they could not adapt and evolve to survive,” he said.
“It shows nothing is guaranteed when it comes to the impact of dramatic changes in the weather. The early humans would have seen the world change beyond all recognition – that could easily happen again and we cannot take for granted that we will even be around to witness it. The only thing we can predict with any certainty is that the change will be massive.”
The research is published in the journal Nature .
Thank you for registering Please refresh the page or navigate to another page on the site to be automatically logged in Please refresh your browser to be logged in
Join our commenting forum
Join thought-provoking conversations, follow other Independent readers and see their replies
Comments