An emotional climate: Legislators’ emotional engagement with climate issues across age, party and time

Abstract What makes politicians personally invested in climate issues? While we know which politicians speak on climate issues, we lack knowledge of whether they do so out of electoral reasons or being assigned to this issue by their party leaders or whether they are personally invested in these issues. I argue that young members of parliament (MPs) and MPs from green and progressive parties are more emotionally invested in climate issues and that the emotional investment in climate issues has increased over time for all MPs. I use data on the emotional engagement of MPs during their speeches in the German Bundestag from 2011 to 2020 measuring emotional engagement via vocal pitch. Analyzing within-MP variation, I find that MPs are overall more emotionally engaged when giving speeches mentioning climate issues and that this effect has increased substantially over time. Contrary to my expectations, I find no difference between MPs with a different age or party affiliation. These findings have important implications for understanding the drivers of the personal engagement of politicians with climate issues. They indicate that both support of climate action and opposition to it may increase emotional engagement.