Lesson Topics: astronomy, earth science, extinction
Skill Focus: Speaking, Vocabulary, Reading
Approximate Class Time: 1.75 hours
Lesson Plan Download: complex-life-on-earth-upper-intermediate-072026.docx
Lesson Overview:
- Students first warm up with questions on science and creation.
- The lesson's input is a 336-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.
UPPER-INTERMEDIATE (B2/C1) Lesson on The Timeline for Life on Earth
Warm-up
- What type of scientific topics interest you?
- Where do you think humans came from?
- 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 brightness, the two outcomes, 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 would be a problem for Earth because the Sun will likely expand enough to swallow Earth in approximately 5 billion years. However, by this point life on Earth will already have ended long before due to CO₂ depletion or extreme heat.
- Previous studies predicted that complex life would end sooner — in under 1 billion years. The new study extends that estimate to approximately 1.8 billion years, which is considerably longer than previously believed.
- In Outcome #1 (strong weathering), Earth's natural cooling process works effectively, keeping temperatures stable but gradually depleting CO₂ until plants die. In Outcome #2 (weak weathering), the cooling process is too weak, so temperatures rise to levels that kill plant life instead.
- (Open-ended/inferential: microbes do not rely on photosynthesis in the same way plants do. Some can survive on chemical reactions in rocks rather than sunlight or CO₂, making them far more tolerant of extreme conditions.)
- The four solutions are: spreading particles into the upper atmosphere to block sunlight, moving Earth farther from the Sun, making the Sun smaller, and evolution creating more resilient plants. (Open-ended for viability: most students will identify evolution as most realistic and the astronomical options as most far-fetched.)
- (Open-ended: personal response. No fixed answer.)
Vocabulary answer key: 1-g, 2-e, 3-i, 4-f, 5-k, 6-h, 7-b, 8-a, 9-j, 10-d, 11-l, 12-c
Collocations: 1-b, 2-f, 3-c, 4-h, 5-d, 6-e, 7-a, 8-g
[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/, https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2025JD045586