A pioneering scientist in atmospheric carbon dioxide measurement and Al Gore's former professor, whose work forms a foundational part of the evidence for global climate change referenced in Gore's narrative.

Al Gore's young son, whose accident serves as a catalyst for Gore's dedication to environmental issues, marking a significant turning point in his personal and professional life.

Al Gore's father, a politician who greatly influenced his son's public service career and instilled in him a deep appreciation for nature and responsibility towards environmental stewardship.

Al Gore's sister, whose qualities and untimely death from lung cancer are used as a poignant illustration of the consequences of prioritizing corporate profits over public health.

A figure associated with environmental policy during the Bush-Cheney administration, identified by Gore as an obstacle due to his past role in campaigns aimed at creating public doubt about climate change.