mass-extinctions

This chapter explores the concept of mass extinctions or 'great dyings' in Earth's history, focusing on possible causes such as changes in shallow inland seas and cosmic radiation. It introduces cosmic rays as highly energetic particles originating from stars and supernovas that constantly bombard Earth, and discusses their potential impact on living cells, particularly through DNA mutations. The chapter also explains the biochemical basis of life, emphasizing enzymes and chromosomes as carriers of genetic information, and hints at the vulnerability of life to changes at the molecular level.

This chapter from "The Uninhabitable Earth" challenges common misconceptions about climate change, emphasizing its rapid acceleration and unprecedented scale within a single human lifetime. It highlights the historical context of mass extinctions driven by greenhouse gases, the recent surge in carbon emissions, and the profound social consequences such as climate refugees. The author reflects on personal and societal complacency, underscoring the urgent responsibility of the current generation to address the climate crisis.