Despite concerns about politicization and polarization in climate change news, previous work has not been able to offer evidence concerning long-term trends. Using computer-assisted content analyses of all climate change articles from major newspapers in the United States between 1985 and 2017, we find that media representations of climate change have become (a) increasingly politicized, whereby political actors are increasingly featured and scientific actors less so and (b) increasingly polarized, in that Democratic and Republican discourses are markedly different. These findings parallel trends in U.S. public opinion, pointing to these features of news coverage as polarizing influences on climate attitudes.

中文翻译：

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气候变化新闻内容中的政治化和两极分化，1985-2017

尽管人们担心气候变化新闻中的政治化和两极分化，但以前的工作未能提供有关长期趋势的证据。对 1985 年至 2017 年间美国主要报纸上的所有气候变化文章进行计算机辅助内容分析，我们发现媒体对气候变化的描述已经变得 (a) 越来越政治化，政治参与者越来越多，而科学参与者则越来越少(b) 日益两极分化，因为民主党和共和党的话语明显不同。这些发现与美国舆论的趋势平行，指出新闻报道的这些特征对气候态度的两极分化影响。