Challenging cognitive, somatic, and behavioral responses to climate change are often conceptualized as climate anxiety (CA). Due to the increased recognition of the impacts of climate change on mental health, a growing body of scientific literature is developing. The purpose of this manuscript is to review the current evidence base for CA and propose future research needs for this emerging construct. Early evidence supports underlying psychological mechanisms in the development and maintenance of CA, which are similar to other anxiety-related conditions. However, the study of CA poses unique challenges to researchers. The psychological impacts that occur in the context of climate change may be adaptive depending on the imminent threat of natural disasters, forced migration, or other climate-related challenges. Due to the potentially adaptive nature of CA and limited current evidence, a coordinated research program of climate-related distress is necessary. A review of the extant literature identified current gaps in understanding the epidemiology and individual differences that promote CA. Current evidence supports the prominent role of neuroticism, intolerance of uncertainty, and rumination. The development of evidence-based models of climate-related distress may provide a more valid and comprehensive depiction of the impacts of climate change on mental health. Transdiagnostic treatment methods are likely the most appropriate intervention for climate-related distress. As models, measures, and treatments of climate-related distress are developed, it is crucial to incorporate studies of populations most at risk for climate change-related mental health effects.