Land Plant Extinction Projected Within Two Billion Years
A 2026 study models the impact of rising solar luminosity on the atmospheric carbon dioxide levels needed for photosynthesis.
Updated on Oct. 24, 2026 in Environmental
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A 2026 study published in the Journal of Geophysical Research: Atmospheres models the future of Earth's vegetative biosphere as the Sun brightens. Researchers Jacob Haqq-Misra and Eric Wolf project that land plants could face extinction within 1.68 to 1.87 billion years due to rising temperatures and shifting carbon dioxide levels.
Why it matters
Understanding the interaction between stellar evolution and atmospheric chemistry helps define the long-term habitability of Earth. The study illustrates how geological weathering and solar output create critical deadlines for the biological processes required to sustain complex life.
The researchers modeled scenarios where atmospheric carbon dioxide drops to 10 parts per million. These projections identify a window between 1.35 billion and 1.87 billion years where the combination of solar luminosity and heat renders current photosynthetic pathways unsustainable.
The players
Jacob Haqq-Misra
A researcher who focuses on planetary habitability and the long-term evolution of the biosphere.
Eric Wolf
An atmospheric scientist specializing in climate modeling and the habitability of Earth-like planets.
The details
The study utilized a three-dimensional climate model—a computer simulation representing atmospheric and surface energy flows—to analyze how the Sun's increasing brightness impacts Earth. As the Sun matures, it emits more energy, which accelerates the geological weathering of rocks, a process that naturally pulls carbon dioxide out of the atmosphere. When carbon dioxide levels fall too low, photosynthesis, the process by which plants convert sunlight into chemical energy, becomes biologically impossible. The model specifically tracked C4 photosynthesis, a specialized carbon-fixation pathway used by many grasses, alongside general land plant survival limits.
Timeline
2026: Researchers published the study in the Journal of Geophysical Research: Atmospheres.
1.35 billion years: Projected limit for C4 photosynthesis under low-carbon scenarios.
1.68 billion years: Estimated timeframe when most land plants become unable to survive.
1.84 billion years: Potential maximum survival limit for select plant life.
1.87 billion years: Projected point when extreme heat prevents all land plant life.
The Tech Race
This study contributes to the broader effort to map the temporal limits of the Habitable Zone in exoplanetary science. By defining precise benchmarks for vegetative collapse, it provides a reference point for evaluating the potential longevity of other Earth-like worlds.
These findings provide a long-term scientific perspective on planetary health that does not alter current environmental practices. The research serves as a fundamental benchmark for understanding the outer boundaries of Earth's biological lifespan.
The takeaway
This research confirms that the biological window for land plants is finite due to the Sun's inevitable increase in luminosity. Readers can monitor ongoing research into geological carbon sequestration and atmospheric modeling to see how these timelines are updated as climate simulations improve.
Further reading
For more on the long-term outlook for our ecosystem, visit the Environmental section.
Source note: This article includes information reported by Economic Times.
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