Public awareness has an important effect on the legislation and implementation of climate change policies. Against the backdrop of the "Big Data Era," social media is an appealing and promising tool for a timely and complete understanding of public perception and attitudes towards climate policies. This paper examines the public's spontaneous attention and awareness about carbon emissions trading (ETS). Tweets related to the EU-ETS, published between 2008 and 2019, were collected for multi-dimensional analysis. Empirical results show several important findings. First, public attention on the EU-ETS has increased significantly since 2011. Second, government officials and industry practitioners have a stronger influence in the discussions than the public and industrial enterprises. Third, topic followers mostly gathered in Belgium (16.65%), the UK (11.6%), and some non-regulated countries like the US and Australia. Fourth, the public mainly focused on the policies and legislation, allowance price, and allocation. The innovation of this study rests in the development of a social media data-based research framework to examine the public's cognition of climate policies, which integrates the advantages of public social media, social network analysis, and text topic analysis. This study provides comprehensive analysis and support for climate policy implementation and public acceptance improvement.

公众意识对气候变化政策的立法和实施具有重要影响。在“大数据时代”的背景下，社交媒体是一种极具吸引力和前景的工具，可以及时、全面地了解公众对气候政策的看法和态度。本文考察了公众对碳排放交易（ETS）的自发关注和意识。收集了 2008 年至 2019 年间发布的与 EU-ETS 相关的推文进行多维分析。实证结果显示了几个重要的发现。一是公众对EU-ETS的关注度自2011年以来明显增加。二是政府官员和行业从业者在讨论中的影响力大于公众和工业企业。第三，话题关注者主要聚集在比利时（16. 65%)、英国 (11.6%) 以及美国和澳大利亚等一些不受监管的国家。第四，公众主要关注政策立法、配额价格和分配。本研究的创新在于建立了一个基于社交媒体数据的研究框架，以检验公众对气候政策的认知，该框架融合了公共社交媒体、社交网络分析和文本主题分析的优势。本研究为气候政策的实施和公众接受度的提高提供了全面的分析和支持。本研究的创新在于建立了一个基于社交媒体数据的研究框架，以检验公众对气候政策的认知，该框架融合了公共社交媒体、社交网络分析和文本主题分析的优势。本研究为气候政策的实施和公众接受度的提高提供了全面的分析和支持。本研究的创新在于建立了一个基于社交媒体数据的研究框架，以检验公众对气候政策的认知，该框架融合了公共社交媒体、社交网络分析和文本主题分析的优势。本研究为气候政策的实施和公众接受度的提高提供了全面的分析和支持。