According to Weber's psychological theory of the finite pool of worry, people avoid dealing with multiple negative events at the same time. Consistent with this theory, as people worry more about the COVID-19 pandemic, they tend to neglect the problem of climate change. Here, we examine the number and content of climate change discussions on Twitter from 2019 through 2021. We show that as COVID-19 cases and deaths increase, climate change tweets have a less negative sentiment. There is also less content associated with fear and anger, the emotions related to worry and anxiety. These results support the finite pool of worry hypothesis and imply that the pandemic redirects public attention from the important problem of climate change mitigation.
Climate change mitigation has been one of the world's most salient issues for the past three decades. However, global policy attention has been partially diverted to address the COVID-19 pandemic for the past 2 y. Here, we explore the impact of the pandemic on the frequency and content of climate change discussions on Twitter for the period of 2019 to 2021. Consistent with the “finite pool of worry” hypothesis both at the annual level and on a daily basis, a larger number of COVID-19 cases and deaths is associated with a smaller number of “climate change” tweets. Climate change discussion on Twitter decreased, despite 1) a larger Twitter daily active usage in 2020 and 2021, 2) greater coverage of climate change in the traditional media in 2021, 3) a larger number of North Atlantic Ocean hurricanes, and 4) a larger wildland fires area in the United States in 2020 and 2021. Further evidence supporting the finite pool of worry is the significant relationship between daily COVID-19 cases/deaths on the one hand and the public sentiment and emotional content of climate change tweets on the other. In particular, increasing COVID-19 numbers decrease negative sentiment in climate change tweets and the emotions related to worry and anxiety, such as fear and anger.