The chapter explores the importance of the James Webb Space Telescope (JWST) in detecting biosignatures like oxygen in exoplanets' atmospheres, potentially indicating the presence of alien life. It discusses the shift towards using advanced technology to study molecules in the atmosphere of exoplanets for signs of extraterrestrial life, including the detection of chlorofluorocarbons that may suggest a technological civilization. The chapter also delves into topics like global warming, the Fermi Paradox, the Rare Earth Hypothesis, and the distinction between biosignatures and technosignatures in the search for extraterrestrial life.

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