Triggering a Climate Change Dominated “Anthropocene”: Is It Common among Exocivilizations?
- 14 October 2021
- journal article
- research article
- Published by American Astronomical Society in The Astronomical Journal
- Vol. 162 (5), 196
- https://doi.org/10.3847/1538-3881/ac1a71
Abstract
We seek to model the coupled evolution of a civilization and its host planet through the era when energy harvesting by the civilization drives the planet into new and adverse climate states. In this way, we ask if triggering "Anthropocenes" of the kind humanity is experiencing might be a generic feature of planet-civilization evolution. This question has direct consequences for both the study of astrobiology and the sustainability of human civilization. Furthermore, if Anthropocenes prove fatal for some civilizations then they can be considered as one form of a "Great Filter" and are therefore relevant to discussions of the Fermi Paradox. In this study, we focus on the effects of energy harvesting via combustion and vary the planet's initial chemistry and orbital radius. We find that in this context, the most influential parameter dictating a civilization's fate is their host planet's climate sensitivity, which quantifies how global temperatures change as CO2 is added to the atmosphere. Furthermore, this is in itself a function of the planet's atmospheric CO2 level, so planets with low levels of CO2 will have high climate sensitivities and high probabilities of triggering climate change. Using simulations of the coupled nonlinear model combined with semi-analytic treatments, we find that most planets in our initial parameter space experience diminished growth due to climate effects, an event we call a "climate-dominated Anthropocene."Keywords
This publication has 30 references indexed in Scilit:
- Reduced albedo on early Mars does not solve the climate paradox under a faint young SunAstronomy & Astrophysics, 2012
- How does the Earth system generate and maintain thermodynamic disequilibrium and what does it imply for the future of the planet?Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2012
- Early warning of climate tipping pointsNature Climate Change, 2011
- Tipping elements in the Earth's climate systemProceedings of the National Academy of Sciences of the United States of America, 2008
- Five- or six-step scenario for evolution?International Journal of Astrobiology, 2008
- Implications of an Anthropic Model of Evolution for Emergence of Complex Life and IntelligenceAstrobiology, 2008
- Why O2Is Required by Complex Life on Habitable Planets and the Concept of Planetary "Oxygenation Time"Astrobiology, 2005
- The “anthropocene”Journal de Physique IV, 2002
- Habitable Planets with High ObliquitiesIcarus, 1997
- Colonization of the GalaxyIcarus, 1976