Just before the European election in May 2019 a YouTube video titled The Destruction of the CDU (Rezo, 2019a) caused political controversy in Germany. The video by the popular German YouTuber Rezo attacked the conservative Government party CDU ( Christlich Demokratische Union Deutschlands ) mainly for climate inaction. As a reaction to the subsequent attacks on Rezo and his video from the political establishment an alliance of popular German YouTubers formed to release a second video. In this video, the YouTubers asked their followers not to vote for the Government or the far-right parties, because they would ignore the expertise of scientists and the scientific consensus on anthropogenic climate change and therefore be unable to provide sustainable solutions for the future. This debate started as a YouTube phenomenon but quickly evolved into a national public discussion that took place across various social media channels, blogs, newspapers, and TV news, but also e.g., in discussions in schools, churches, as well as arts and cultural events. The focus of this contribution is on the formation of the heterogeneous coalition that emerged to defend and support the YouTubers. It prominently involved scientists and scientific expertise, but other forms of expertise and ‘worlds of relevance’ were also part of this coalition. The conceptual tools of ‘networked expertise’ and ‘ethno-epistemic assemblages’ are employed to explore expertise and credibility as well as the associations and networks of actors involved which illuminate how a single YouTuber was able to contribute to the unleashing of a national debate on climate change policy.

中文翻译：

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雷佐和德国的气候变化政策：网络专业知识对YouTube及其他领域的影响

就在2019年5月欧洲大选之前，一个名为``CDU的破坏''（Rezo，2019a）的YouTube视频在德国引起了政治争议。受欢迎的德国YouTuber Rezo的视频主要是针对气候无所作为，攻击了保守党政府CDU（克里斯蒂希·德意志民主联盟德国）。为了回应政治组织随后对雷佐及其录像带的袭击，一个受欢迎的德国YouTubers联盟成立，发行了第二个录像带。在此视频中，YouTuber要求其追随者不要投票赞成政府或极右翼政党，因为他们将忽略科学家的专业知识和人为气候变化的科学共识，因此无法为未来提供可持续的解决方案。这场辩论最初是从YouTube现象开始的，后来迅速演变成全国性的公共讨论，涉及各种社交媒体渠道，博客，报纸和电视新闻，但也包括学校，教堂的讨论以及艺术和文化活动。这项贡献的重点是为了捍卫和支持YouTubers而建立的异构联盟。它主要涉及科学家和科学专业知识，但是其他形式的专业知识和“相关世界”也是该联盟的一部分。