Introduction. The notion of climate change anxiety (aka eco-anxiety) has gained traction in the last years as a consequence, though indirect, of climate change on mental health. Yet uncertainty remains regarding the variations of climate change anxiety across demographic characteristics (e.g., geographic locations, gender, age) and its associations with adaptative (i.e., pro-environmental) behaviors. Moreover, the point-estimate proportion of people experiencing climate anxiety frequently, along with their characteristics, has seldom been probed.Methods. We assessed climate change anxiety (including its related functional impairments), along with demographic characteristics, climate change experience, and pro-environmental behaviors, in 2,080 French-speaking participants from eight African and European countries. Results. 11.64% of the participants reported experiencing climate anxiety frequently, and 20.72% reported experiencing daily life functional impairments (e.g., impact on the ability to go to work or socialize) because of their climate change anxiety. Women and younger people exhibited significantly higher levels of climate anxiety. There was no difference between countries. Climate anxiety was also associated with pro-environmental behaviors. However, this association was significantly weaker in people reporting frequent experiences of climate change anxiety than in people with lower levels.Conclusions. Although the evidence requires further advancement, our result suggests that climate change anxiety might impede the daily life functioning of a substantial proportion of people. Because functional impairments are viewed as risk factors for adverse mental health outcomes, our results point to climate anxiety as a potential threat deserving a careful audit by the scientific community and practitioners.