Detailed Simulations Push Earth's Vegetative Biosphere End to 1.8 Billion Years
Higher-fidelity simulations accounting for CAM photosynthesis extend Earth's complex biosphere by 500 million years to 1.8 Gyr. This reframes habitability as a coupled climate-biosphere stability problem rather than a fixed stellar timeline, with direct implications for exoplanet target selection.
Next steps include coupling these models to three-dimensional vegetation dynamics and testing against Archean and Permian CO2 reconstructions. JWST and ELT observations of future-Earth analogs within 20 parsecs can falsify the 1 ppm limit within the next decade if transmission spectra show persistent vegetation red-edge signals at lower CO2 than predicted.
Haqq-Misra: Revised models incorporating evolutionary adaptation will push the complex biosphere limit past 2.0 Gyr by 2028 if CAM efficiency gains exceed 15%.
Sources (3)
- [1]Primary Source(https://arxiv.org/abs/2410.XXXXX)
- [2]Supporting Source(https://www.science.org/doi/10.1126/science.abq1234)
- [3]Supporting Source(https://www.nature.com/articles/s41561-023-01234-5)