# Biospheres and Technospheres

How do life, environment and technology reshape planetary dynamics? Which feedbacks produce regulation, and what evidence could support claims of planetary agency or organismal organization?

## Planetary feedback and selection

- **Gaia hypothesis** - Proposes that interactions between life and its planetary environment maintain conditions favorable to life. The proposed biosphere-level regulation is a hypothesis; coupled feedback alone does not establish it. [Lovelock and Margulis 1974](<https://doi.org/10.1111/j.2153-3490.1974.tb01946.x> "Atmospheric homeostasis by and for the biosphere: the gaia hypothesis; Tellus").
- **Daisyworld** - Dark and light daisies alter temperature through albedo while temperature controls their growth. This model produces climate regulation over a range of solar inputs; it demonstrates a mechanism, not that Earth behaves identically. [Watson and Lovelock 1983](<https://doi.org/10.1111/j.1600-0889.1983.tb00031.x> "Biological homeostasis of the global environment: the parable of Daisyworld; Tellus B").
- **Selection and planetary regulation** - Doolittle proposes selection through persistence of stabilizing processes. Hermida and Okasha challenge whether such persistence explains adaptation. The dispute concerns what selection must explain about planetary feedback. [Doolittle 2017](<https://doi.org/10.1016/j.jtbi.2017.02.015> "Darwinizing Gaia; J. Theor. Biol."), [Hermida and Okasha 2025](<https://doi.org/10.1098/rstb.2024.0099> "Function, chance and purpose in the biosphere: a critical examination of the Darwinized Gaia hypothesis; Phil. Trans. R. Soc. B").

## Constructed ecosystems

- **Biosphere 2 oxygen loss** - Oxygen fell from 21% to 14% over the first 16 months of enclosure. Soil respiration consumed oxygen while concrete absorbed the released carbon dioxide, masking the respiratory imbalance in atmospheric CO2. [Severinghaus et al. 1994](<https://doi.org/10.1029/94EO00285> "Oxygen loss in biosphere 2; Eos, Transactions American Geophysical Union"), [Severinghaus 1995](<https://digital.library.unt.edu/ark:/67531/metadc680127/m2/1/high_res_d/477735.pdf> "Studies of the Terrestrial O2 and Carbon Cycles in Sand Dune Gases and in Biosphere 2; Columbia University dissertation, chapter 3.1").

## Technology and planetary organization

- **Technosphere** - Treats interconnected technology as a planetary system with energy and material demands that constrain human action. A geological account of technological dependence and persistence, without presuming that the system is an organism. [Haff 2014](<https://doi.org/10.1144/SP395.4> "Technology as a geological phenomenon: implications for human well-being; Geol. Soc. Lond. Spec. Publ.").
- **Planetary intelligence** - Proposes collective knowledge coupled to planetary feedback as a framework for biospheres and technospheres. Distinguishes immature from mature systems through their contribution to long-term planetary functioning. [Frank et al. 2022](<https://www.cambridge.org/core/journals/international-journal-of-astrobiology/article/intelligence-as-a-planetary-scale-process/5077C784D7FAC55F96072F7A7772C5E5> "Intelligence as a planetary scale process; Int. J. Astrobiology").

## Open questions

- Which feedbacks are stabilizing over which environmental ranges, and which arise through selection rather than incidental coupling?
- What observations would distinguish planetary intelligence from distributed processes described metaphorically as intelligent?

## Related topics

- [Hyperorganism](https://hyperorganism.github.io/)
- [Ecological organization and individuality](https://hyperorganism.github.io/collective-life/) - Coordinated effects, community persistence and a reproducing collective are separate possibilities.
- [Recognizing life](https://hyperorganism.github.io/recognizing-life/) - Evidence of biological activity does not by itself establish an organism at planetary scale.
- [Systems Aesthetics](https://hyperorganism.github.io/systems-aesthetics/)