We employed a mixed-methods approach to explore the experiences of young adults concerned about climate change navigating the decision to have kids. We collected data from user-generated content and in-depth interviews with 24 consumers from the United States and New Zealand aged 18 to 35. Using content and thematic analysis, we show that overconsumption, overpopulation, and uncertainty about the future underpinned young adults’ motivations for not having children in response to climate change. Three key recommendations are made for policymakers and businesses wanting to support consumers in having children in the age of climate change.