Lesson Topics: astronomy, earth science, extinction
Skill Focus: Speaking, Vocabulary, Reading
Approximate Class Time: 1.75 hours
Lesson Plan Download: complex-life-on-earth-advanced-072026.docx
Lesson Overview:
- Students first warm up with questions on science and creation.
- The lesson's input is a 358-word reading passage that summarizes a new study entitled Maximum Lifetime of the Vegetative Biosphere, which aims to predict how much time remains for complex life on Earth. The paper models two scenarios in which complex plant life (and human life) dies in approximately 1.8 billion years. The passage also touches on possible techno-solutions that enable life to survive.
- The passage is followed by comprehension questions.
- Next, students match 12 vocabulary items from phrases in the passage to definitions. This is followed by an exercise which requires students to ask questions to each other using some of the new words.
- The lesson has two debate topics on becoming a multi-planetary species and whether humanity will last beyond the year 3000.
- The lesson's main speaking activity has four parts. In the first, students brainstorm and rank current risks to human survival. Afterwards, students review and discuss possible solutions to these issues. Finally, they present their solution to their teacher, a UN representative, who must approve funding for their civilization-saving solution.
- After famous quotations, students review vocabulary and the lesson's collocations.
- Finally, the lesson ends with a few final discussion questions.
ADVANCED (C1/C2) Lesson on The Timeline for Life on Earth
Warm-up
- What type of scientific topics interest you?
- What theory of human creation do you think is most likely?
- Assuming that one day life will end on Earth, how will it happen?
- Would you want to know the exact date of your own death? Why or why not?
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This lesson plan was created by Matthew Barton of EnglishCurrent.com (copyright). Site members may photocopy and edit the file for their classes. Permission is not given to rebrand the lesson, redistribute it on another platform, or sell it as part of commercial course curriculum. Claude was used to generate answer keys and some famous quotations. For questions, contact the author.
Comprehension Question Answer Key:
- (Open-ended: assess for coverage of key points: the Sun's increasing luminosity, the two scenarios, plant die-off timelines, microbial survival, and possible solutions.)
- A Red Giant is a dying star that expands to hundreds of times its original size. It is a problem for Earth because the Sun will likely expand enough to swallow Earth entirely in approximately 5 billion years. (Note: by this point life on Earth will already have ended long before due to CO₂ starvation or extreme heat.)
- In Scenario #1 (strong weathering), the thermostat works effectively, keeping temperatures stable but gradually depleting CO₂ until plants starve. In Scenario #2 (weak weathering), the thermostat is too weak, so CO₂ remains constant but temperatures rise to lethal levels. Both scenarios end complex plant life within roughly the same timeframe.
- The weathering process — rainwater reacting with silicate rocks to draw CO₂ out of the atmosphere — acts as Earth's natural thermostat by cooling the planet when temperatures rise.
- (Open-ended/inferential: microbes do not rely on photosynthesis in the same way plants do. Some derive energy from chemical reactions in rocks rather than sunlight or CO₂, making them far more tolerant of extreme conditions.)
- The four solutions are: geoengineering (spreading aerosols to block sunlight), moving Earth's orbit farther from the Sun, removing mass from the Sun to slow its growth into a Red Giant, and evolution creating more resilient plant adaptations. (Open-ended for viability: most students will identify evolution as most realistic and moving Earth's orbit or removing solar mass as most far-fetched.)
- (Open-ended: personal response. No fixed answer.)
Vocabulary answer key: 1-d, 2-h, 3-l, 4-i, 5-k, 6-c, 7-j, 8-e, 9-f, 10-b, 11-g, 12-a
Collocations: 1-f, 2-I, 3-g, 4-d, 5-a, 6-c, 7-e, 8-h, 9-b
[i] Passage Sources: https://arstechnica.com/science/2026/06/good-news-we-have-extra-time-before-the-sun-ends-life-on-earth/, https://www.livescience.com/planet-earth/study-suggests-life-on-earth-has-around-1-8-billion-years-left, https://www.popularmechanics.com/science/environment/a71818941/life-on-earth/
[ii] https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2025JD045586