The year 2018 was a watershed year for young people's climate activism. In this review article, we explore the methodological trends and key themes across contemporary academic literature on young people's climate activism. In the academic literature, following an initial wave of survey-based research of young people and textual analysis of secondary data like media reportage, the field is experiencing a second wave of qualitative research and a resurgence of emphasis on youth voice in research. Accordingly, we identify the strengths of the existing literature in its exploration of key themes including the composition, practices and outcomes of young people's climate activism, and the ways young people understand and act on climate change. ...