{"id":339891,"date":"2024-08-18T08:25:12","date_gmt":"2024-08-18T06:25:12","guid":{"rendered":"https:\/\/climatescience.press\/?p=339891"},"modified":"2024-08-18T08:25:14","modified_gmt":"2024-08-18T06:25:14","slug":"paper-finds-the-world-was-cooling-for-most-of-the-last-2000-years-and-started-warming-long-before-big-coal-arrived","status":"publish","type":"post","link":"https:\/\/climatescience.press\/?p=339891","title":{"rendered":"Paper finds the world was cooling for most of the last 2,000 years and started warming long before Big Coal arrived"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

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

From JoNova <\/a><\/p>\n\n\n\n

By Jo Nova<\/strong><\/a><\/p>\n\n\n\n

How much money has the world wasted because of some tree ring studies?<\/h4>\n\n\n\n

A Chinese group has looked at all the different kinds of 2,000 year long proxies in the PAGES dataset<\/a> and found that history looks quite different depending on which proxy you pick. Only the tree rings show the HockeyStick shape that matches the climate models. In other proxies, temperatures have fallen for most of the last 2,000 years, especially in the Southern half of the world. And even after the recent warming, we are not yet back to the temperatures the Romans lived through.<\/p>\n\n\n\n

So yet again, we see that that current temperatures are not unusual except according to tree rings, which we know are affected by rising levels of CO2. (The paper does not mention CO2 or carbon or fertilizer).<\/p>\n\n\n\n

\u201cAll the evidence points out that we are still far from a complete understanding of the Common Era temperature<\/a> variability at hemispheric and global scales,\u201d says Professor Yang.\u201d<\/p>\n\n\n\n

\u201cWe show that the millennial cooling of annual mean temperatures is likely a global phenomenon.\u201d<\/p>\n\n\n\n

The world according to tree-rings is at the top, and other proxies, below:<\/strong><\/p>\n\n\n

\n
\"\"<\/figure>\n<\/div>\n\n\n

The map showing that the proxies are spread around the world. There are not that many proxies stretching back 2,000 years:<\/p>\n\n\n\n

\"\"
Figure 1 Locations of the proxy data used for the temperature reconstructions over the past 2000 years.<\/figcaption><\/figure>\n\n\n\n

The paper looked closely at how all the proxies responded to volcano eruptions, and tree rings do seem to be useful. But without acknowledging that trees love carbon dioxide and grow faster with the fertilization effect of extra CO2, it feels like they are dancing around the point. They said tree rings capture the variability of shorter periods (less than 200 years) but that non tree ring proxies were better for variations longer than 200 years. The news that matters the most to mum and dad voters is that they found a significant long term cooling trend, but that information is buried in the text.<\/p>\n\n\n\n

And as so many proxies have shown, global warming started back in the late 1600s, long before human emissions of CO2 started.<\/em><\/p>\n\n\n\n

UPDATE:<\/strong> Look at the non-tree-ring proxy \u2014 the warming began in the Southern Hemisphere before 1700AD. See also the 120 proxies of Christiansen and Ldundqvist<\/a>, and the signal in China<\/a>. What started that? Climate modelers have no idea. <\/em>It wasn\u2019t cars and coal power. It wasn\u2019t man-made CO2. We don\u2019t understand the big forces that drive our climate, yet we make you pay for your imaginary sins anyway.<\/p>\n\n\n\n

Study finds temperature reconstructions during the Common Era are affected by the selection of paleoclimate data<\/a><\/h4>\n\n\n\n

PhysOrg:   \u201c\u2026 we wanted to know how our understanding of climate in the past is dependent on proxies,\u201d says Professor Bao Yang. A paper on this topic is published<\/a> in the journal Science China Earth Sciences<\/em>.<\/p>\n\n\n\n

To do so, the research team led by Professor Yang integrated the longest millennial paleoclimate data in the PAGES proxy network into new versions of global and hemispheric reconstructions of annual temperatures. The results show that the rate of pre-industrial millennial cooling in global and hemispheric temperatures varies according to proxy combination, with the strongest cooling revealed by non-tree-ring proxies<\/a>.<\/p>\n\n\n\n

Yang and colleagues compared the volcanic responses and spectral characteristics of tree-ring and non-tree-ring records. They found that the properties of tree-ring and non-tree-ring data differ significantly.<\/p>\n\n\n\n

REFERENCE<\/h4>\n\n\n\n

Bao Yang et al, (2024) The influence of proxy selection on global annual mean temperature reconstructions during the Common Era, <\/a>Science China Earth Sciences<\/em>. DOI: 10.1007\/s11430-024-1348-3<\/a><\/p>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

A Chinese group has looked at all the different kinds of 2,000 year long proxies in the PAGES dataset and found that history looks quite different depending on which proxy you pick. Only the tree rings show the HockeyStick shape that matches the climate models. In other proxies, temperatures have fallen for most of the last 2,000 years, especially in the Southern half of the world. And even after the recent warming, we are not yet back to the temperatures the Romans lived through.<\/p>\n","protected":false},"author":121246920,"featured_media":339896,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_crdt_document":"","advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"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":[691827130,691818153,691830212,691830211],"class_list":{"0":"post-339891","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","6":"hentry","7":"category-uncategorized","8":"tag-carbon-dioxide-co2","9":"tag-climate-models","10":"tag-fertilization-effect-2","11":"tag-hockeystick","13":"fallback-thumbnail"},"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/08\/0f3313d20c7f36283dfe8e11e9aac6e55.jpg?fit=1400%2C700&ssl=1","jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/paxLW1-1qq7","jetpack-related-posts":[{"id":335234,"url":"https:\/\/climatescience.press\/?p=335234","url_meta":{"origin":339891,"position":0},"title":"Mining For Hockeysticks","author":"uwe.roland.gross","date":"30\/06\/2024","format":false,"excerpt":"The iconic \u201chockeystick\u201d simply refuses to die. 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