III. Ecosmos: A Revolutionary Fertile, Habitable, Solar-Bioplanet Incubator Lifescape
3. Earth Alive: A Cellular GaiaSphere Sustains Her (His) Own Viability
Langmuir, Charles and Wally Broecker. How to Build a Habitable Planet: The Story of Earth from the Big Bang to Humankind. Princeton: Princeton University Press, 2012. Charles Langmuir is a Harvard University professor of geochemistry, and Wallace Broecker, “the grandfather of climate science,” spent a lifetime at the Lamont-Doherty Earth Observatory, Columbia University. A thorough, current scenario of earthkind’s cosmic pedigree and ancient heritage, the volume is a much revised and expanded edition of Broecker’s 1985 classic with the same title. A significance turn is their endeavor to move from an older reduction method to a systems vista that can rightly address nature’s spontaneous propensity for fractal-like self-organized networks. Objects do not exist in isolation, rather equally evident relationships between them from proteins to people can reveal a nested, non-equilibrium, evolutionary vector of cognitive complexity. A 700 page opus, chapters dutifully course from origins, elements, galaxies, stars, planets, to their expertise of “earth and life as natural systems.” Sunshine, warm water, and air to breath bring vitalities, along with mobile continental landforms. Cellular organisms are then seen to co-evolve with planetary processes, with a positive nod to the Gaia vision. And we humankin people arrive who by radical increases in energy usage initiate a global Anthropozoic era, in much need of respectful maintenance.
We also emphasize a “systems” approach to the history and understanding of our planet, and emphasize the linkages of all parts of the Earth system, as well as the relationship of those parts to the solar system and universe. If there is one theme that we hope comes through in the book, it is of a connected universe in which human beings are an outgrowth and integral part. (xv)
Lenton, Tim and Andrew Watson. Revolutions that Made the Earth. Oxford: Oxford University Press, 2011. University of East Anglia earth systems scientists join the Gaia vista of their mentor James Lovelock with the Major Transitions model of John Maynard Smith and Eors Szathmary to view life’s evolution from origin to Oxford as due to a few huge sequential phase changes. With some scale malleability, this includes Inception: rudimentary prokaryotes, Oxygen: photosynthesis, Complexity: nucleated eukaryotes and organisms, and Us: human beings as intelligent observers. But whether L & W’s four or MS & S’s eight stages (which also see information as a main factor), they seem somewhat arbitrary, unable to allow anything going on to spontaneously drive and be iteratively manifest in such a scalar ascendance. Anyway, to open the first chapter, an effective metaphor is used whereof our historical learning experience across widening spatial and temporal realms is seen in a dreamlike way as if humankind is slowly awakening.
In this book, we want to weave many strands of science together to present a narrative of Earth’s history and how we came to be here. It is a ‘systems view’ in that it considers the evolution of life and of the non-living environment as one coupled, indivisible process. This process has not been smooth and continuous: a series of just a few revolutions have created us and the world we enjoy today. Each revolution was inherently difficult, and each was built on the previous one. They all had to occur in the sequence they did to allow us – a conscious ‘observer’ species – to evolve, which could then look back and marvel at this history. (5)
Lenton, Timothy and Marcel van Oijen. Gaia as a Complex Adaptive System. Philosophical Transactions of the Royal Society of London B. 357/683, 2002. The whole Earth system is considered as a manifestation of the way in which many local, interactive agents give rise to a self-regulating order.
Lenton, Timothy, et al. Life on Earth is Hard to Spot. Anthropocene Review. May, 2020. Gaia advocates TL, University of Exeter, Sebastien Dutreuil, University of Aix-Marseille, and Bruno Latour, Sciences Po, France note the long last acceptance of James Lovelock’s biospheric self-regulation over evolutionary spans by life’s composite vitalities. But this organic essence, here noted with a capital L, is not immediately evident. A teleology issue also needs to be clarified, which perturbs R. Dawkins, but overall a 2020 vision of a habitable bioworld is now well in place as evinced by its practical utility for Earth systems scientists.
The triumph of the Gaia hypothesis was to spot the extraordinary influence of Life on the Earth. ‘Life’ is the clade including all extant living beings, as distinct from ‘life’ the class of properties common to all living beings. ‘Gaia’ is Life plus its effects on habitability. Life’s influence on the Earth was hard to spot for several reasons: biologists missed it because they focused on life not Life; climatologists missed it because Life is hard to see in the Earth’s energy balance; Earth system scientists opted instead for abiotic or human-centred approaches to the Earth system; Scientists in general were repelled by teleological views that Life acts to maintain viable conditions. Instead, we reason from organisms’ metabolisms outwards, showing how Life’s coupling to its environment has led to profound effects on Earth’s biosphere. (Abstract)
Lenton, Timothy, et al. Selection for Gaia across Multiple Scales. Trends in Ecology and Evolution. Online July, 2018. A problem has remained to square theories of life’s evolutionary self-regulation with Darwinian selection. Here University of Exeter, Southampton, and Lincoln, UK Earth system scientists including James Dyke and David Wilkinson offer an expanded view of its sequential stages from micro individual homeostasis and groupings, onto vegetation, soil, desert and ocean environs, as they reach macro regimes of conducive global atmospheres. Selective effects can then become spread out and mollified over this hierarchical tenure.
Recently postulated mechanisms and models can help explain the enduring ‘Gaia’ puzzle of environmental regulation mediated by life. Natural selection can produce nutrient recycling at local scales and regulation of heterogeneous environmental variables at ecosystem scales. However, global-scale environmental regulation involves a temporal and spatial decoupling of effects from actors that makes conventional evolutionary explanations problematic. Instead, global regulation can emerge by a process of ‘sequential selection’ in which systems that destabilize their environment are short-lived and result in extinctions and reorganizations until a stable attractor is found. Thus, Earth system feedbacks provide a filter for persistent combinations of macroevolutionary innovations. (Abstract)
Lin, Douglas. The Genesis of Planets. Scientific American. May, 2008. Based on novel extrasolar observations, the founding director of the Kavli Institute for Astronomy and Astrophysics at Peking University explains the latest revised model of planetary occasion. Rather than an orderly coalescence, a chaotic interplay proceeds as interstellar clouds collapse into a grainy disk, which goes on to ‘germinate planetary embryos.’ Gas giants are formed, joined by other large worlds, and finally earths may appear. Such widely disparate spherical objects are arrayed in haphazard fashion around an equally vicarious sun star or two. How incredible might it then seem that on one infinitesimal orb a sentient awareness via you and I and everyone suddenly pops into collaborative being and cognizance? For whatever purpose are we granted this vista, what grand discovery and transfiguration might we imagine?
Lin, Guangxing and Zuntao Fu. A Universal Model to Characterize Different Multi-Fractal Behaviors of Daily Temperature Records over China. Physica A. 387/573, 2008. Peking University physicists quantify that even atmospheric phenomena can be found to exhibit a power-law scale similarity. As an analog, we add that ocean temperature gradients also hold to such mathematics, which then influence fish schools to do the same.
Lovelock, James. Gaia: A New Look at Life on Earth. New York: Oxford University Press, 1979. The original work by a British atmospheric chemist who initiated the modern conception of the planet as a self-sustaining entity.
Lovelock, James. Healing Gaia. New York: Harmony Books, 1991. An illustrated exposition of a “planetary medicine” which is now imperative to cope with the perilous human impact on earth’s life support systems.
Lovelock, James. The Living Earth. Nature. 426/769, 2003. A recent summary of the Gaia hypothesis whereby organisms and their environment co-evolve so as to maintain the biosphere as a single, self-regulating system.
Luhr, James, editor-in-chief. Earth. New York: DK Publishing, 2003. This profusely illustrated encyclopedia is a great resource for the evolution, structure, dynamics and composition of our home planet in its cosmic setting.
Lyons, Timothy, et al. Oxygenation, Life and the Planetary System during Earth’s Middle History. Astrobiology. July 21, 2021. Six geoscientists from UC Riverside, Yale, China University of Geosciences and Georgia Tech advance understandings of how our habitable, self-sustaining bioworld could to exhibit some manner of an inherent biological development, maybe along a course to our retrospective.
The long history of life on Earth has unfolded as a cause-and-effect relationship with the evolving amount of oxygen in the oceans and atmosphere. An oxygen deficiency held over the first 2 billion years, yet evidence for biological O2 and local ocean enrichments appear before O2 in the atmosphere some 2.3 billion years ago. However, the relationship between complex life (eukaryotes, including animals) and later oxygenation is less clear. The apparent rise in O2 around 800 million years ago is coincident with major developments in complex life. This paper focuses on the geochemical records of Earth's middle history, roughly 1.8 to 0.5 billion years ago, so to explore an interactivity with biological evolution. A richer understanding of the interplay between coevolving life and Earth surface environments can provide a template for studies of sustained habitability on distant exoplanets. (Abstract excerpt)
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