{"id":16277,"date":"2017-03-23T10:58:56","date_gmt":"2017-03-23T15:58:56","guid":{"rendered":"http:\/\/blogs.edf.org\/climate411\/?p=16277"},"modified":"2026-04-10T16:29:06","modified_gmt":"2026-04-10T21:29:06","slug":"how-do-we-know-that-humans-are-causing-climate-change-these-nine-lines-of-evidence","status":"publish","type":"post","link":"https:\/\/blogs.edf.org\/climate411\/2017\/03\/23\/how-do-we-know-that-humans-are-causing-climate-change-these-nine-lines-of-evidence\/","title":{"rendered":"How do we know that humans are causing climate change? These nine lines of evidence"},"content":{"rendered":"<p>While <a href=\"http:\/\/climatecommunication.yale.edu\/visualizations-data\/ycom-us-2016\/\">most Americans<\/a> acknowledge that climate change is happening, some are still unsure about the causes.<\/p>\n<p>They are often labeled \u201cclimate skeptics,\u201d but that label can cause confusion or even anger.<\/p>\n<p>Isn\u2019t the nature of science to be skeptical? Isn\u2019t it good to question everything?<\/p>\n<p>Yes, but \u2014<\/p>\n<p><strong>Here\u2019s what is getting lost in the conversation:<\/strong><\/p>\n<p>Scientists have been asking these questions for <a href=\"https:\/\/www.climate-lab-book.ac.uk\/2010\/a-brief-history\/\">nearly 200 years<\/a>. The scientific community has been studying these questions for so long that collectively they have amassed an overwhelming amount of evidence pointing to a clear conclusion.<\/p>\n<p>A similar situation is smoking and cancer. Nowadays, no one questions the link between smoking and cancer, because the science was settled in the 1960s after more than 50 years of research. The questions have been asked and answered with indisputable evidence.<\/p>\n<p>We can think of the state of human activities and climate change as <a href=\"https:\/\/extranewsfeed.com\/what-climate-skeptics-taught-me-about-global-warming-5c408dc51d32#.myvsq6beh\">no different<\/a> than smoking and cancer. In fact, we are statistically <a href=\"https:\/\/www.edf.org\/blog\/2013\/11\/14\/seven-things-you-should-know-about-uns-new-ipcc-climate-change-report\">more confident<\/a> that humans cause climate change than that smoking causes cancer.<\/p>\n<p>Our confidence comes from the culmination of <a href=\"https:\/\/www.climate-lab-book.ac.uk\/2010\/a-brief-history\/\">over a century<\/a> of research by <em>tens of thousands<\/em> of scientists at hundreds of institutions in more than a hundred nations.<\/p>\n<p><strong>So what is the evidence?<\/strong><\/p>\n<p>The research falls into nine independently-studied but physically-related lines of evidence, that build to the overall clear conclusion that humans are the main cause of climate change:<\/p>\n<ol>\n<li><strong>Simple chemistry<\/strong> that when we burn carbon-based materials, carbon dioxide (CO<sub>2<\/sub>) is emitted (<em>research beginning in <\/em><a href=\"https:\/\/history.aip.org\/climate\/co2.htm\"><em>19<\/em><em>00s<\/em><\/a>)<\/li>\n<li><strong>Basic accounting<\/strong> of what we burn, and therefore how much CO<sub>2<\/sub> we emit (<em>data collection beginning in <a href=\"https:\/\/www.eia.gov\/about\/legislative_timeline.php\">1970s<\/a><\/em>)<\/li>\n<li><strong>Measuring CO<sub>2<\/sub><\/strong> in the atmosphere and trapped in ice to find that it is indeed increasing and that the levels are higher than anything\u00a0we&#8217;ve seen in hundreds of thousands of years \u00a0(<em>measurements beginning in <\/em><a href=\"http:\/\/www.climatecentral.org\/gallery\/graphics\/keeling_curve\"><em>1950s<\/em><\/a>)<\/li>\n<li><strong>Chemical analysis <\/strong>of the atmospheric CO<sub>2<\/sub> that reveals the increase is coming from burning fossil fuels (<em>research beginning in <\/em><a href=\"http:\/\/uscentrist.org\/platform\/positions\/environment\/context-environment\/docs\/Revelle-Suess1957.pdf\"><em>1950s<\/em><\/a>)<\/li>\n<li><strong>Basic physics<\/strong> that shows us that CO<sub>2<\/sub> absorbs heat (<em>research beginning in <\/em><a href=\"https:\/\/skepticalscience.com\/history-climate-science.html\"><em>1820s<\/em><\/a>)<\/li>\n<li><strong>Monitoring climate conditions<\/strong> to find that recent warming of the Earth is correlated to and follows rising CO<sub>2<\/sub> emissions (<em>research beginning in <\/em><em>1930s<\/em>)<\/li>\n<li><strong>Ruling out natural factors<\/strong> that can influence climate like the Sun and ocean cycles (<em>research beginning in <\/em><em>1830s<\/em>)<\/li>\n<li><strong>Employing computer models<\/strong> to run experiments of natural vs. human-influenced \u201csimulated Earths\u201d (<em>research beginning in <\/em><a href=\"https:\/\/www.gfdl.noaa.gov\/brief-history-of-global-atmospheric-modeling-at-gfdl\/\"><em>1960s<\/em><\/a>)<\/li>\n<li><strong>Consensus among scientists <\/strong>that consider all previous lines of evidence and make their own conclusions (<em>polling beginning in <\/em><a href=\"http:\/\/iopscience.iop.org\/article\/10.1088\/1748-9326\/11\/4\/048002\"><em>1990s<\/em><\/a>)<\/li>\n<\/ol>\n<p>(You can also see these nine lines of evidence illustrated in the graphic below)<\/p>\n<p>Skeptics sometimes point to the last two supporting lines of evidence as weaknesses. They\u2019re not. But even if you choose to doubt them, it is really the first seven that, combined, point to human activities as the only explanation of rising global temperatures since the Industrial Revolution, and the subsequent climate changes (such as ice melt and sea level rise) that have occurred due to this global warming.<\/p>\n<p>The science <em>is<\/em> settled, and the sooner we accept this, the sooner we can work together towards addressing the problems caused by climate change \u2013 and towards a better future for us all.<\/p>\n<p><a href=\"https:\/\/blogs.edf.org\/climate411\/wp-content\/blogs.dir\/7\/files\/2017\/03\/HumansGraphic_EDF.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-16293\" src=\"https:\/\/blogs.edf.org\/climate411\/wp-content\/blogs.dir\/7\/files\/2017\/03\/HumansGraphic_EDF.jpg\" alt=\"\" width=\"799\" height=\"1532\" srcset=\"https:\/\/blogs.edf.org\/climate411\/wp-content\/blogs.dir\/7\/files\/2017\/03\/HumansGraphic_EDF.jpg 799w, https:\/\/blogs.edf.org\/climate411\/wp-content\/blogs.dir\/7\/files\/2017\/03\/HumansGraphic_EDF-156x300.jpg 156w, https:\/\/blogs.edf.org\/climate411\/wp-content\/blogs.dir\/7\/files\/2017\/03\/HumansGraphic_EDF-768x1473.jpg 768w, https:\/\/blogs.edf.org\/climate411\/wp-content\/blogs.dir\/7\/files\/2017\/03\/HumansGraphic_EDF-534x1024.jpg 534w\" sizes=\"auto, (max-width: 799px) 100vw, 799px\" \/><\/a><\/p>\n<p>(<a href=\"https:\/\/blogs.edf.org\/climate411\/wp-content\/blogs.dir\/7\/files\/2017\/03\/EDF_HumansClimateChangeInfographic.pdf\">Click here for a pdf version of the graphic<\/a>)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>While most Americans acknowledge that climate change is happening, some are still unsure about the causes. They are often labeled \u201cclimate skeptics,\u201d but that label can cause confusion or even anger. Isn\u2019t the nature of science to be skeptical? Isn\u2019t it good to question everything? Yes, but \u2014 Here\u2019s what is getting lost in the &#8230;<\/p>\n","protected":false},"author":40054,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[95,202,42,397],"tags":[],"coauthors":[108226],"class_list":["post-16277","post","type-post","status-publish","format-standard","hentry","category-basic-science-of-global-warming","category-greenhouse-gas-emissions","category-science","category-truth-squad"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How do we know that humans are causing climate change? 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