{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,2]],"date-time":"2026-09-02T05:21:02Z","timestamp":1788326462219,"version":"build-2803163510"},"reference-count":157,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2026,8,28]],"date-time":"2026-08-28T00:00:00Z","timestamp":1787875200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Research Grants Council (RGC) of Hong Kong","award":["27303926"],"award-info":[{"award-number":["27303926"]}]},{"DOI":"10.13039\/501100003803","name":"University of Hong Kong","doi-asserted-by":"publisher","award":["Dr. Stephen S. F. Hui Trust Fund"],"award-info":[{"award-number":["Dr. Stephen S. F. 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Hui Trust Fund"]}],"id":[{"id":"https:\/\/ror.org\/02zhqgq86","id-type":"ROR","asserted-by":"publisher"}]},{"award":["Meng Guo's Startup Fund"],"award-info":[{"award-number":["Meng Guo's Startup Fund"]}],"id":[{"id":"https:\/\/ror.org\/02zhqgq86","id-type":"ROR","asserted-by":"publisher"}]},{"award":["Seed Fund for Basic Research for New Staff"],"award-info":[{"award-number":["Seed Fund for Basic Research for New Staff"]}],"id":[{"id":"https:\/\/ror.org\/02zhqgq86","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Life"],"abstract":"<jats:p>Earth\u2019s early history provides the only natural record for evaluating how planetary evolution can generate environments capable of initiating life. Here we review early Earth evolution through the lens of urability: the time-dependent capacity of planetary environments to support prebiotic chemistry progressing toward compartmentalized, self-propagating, information-bearing systems. We argue that urability is not a single globally habitable state, but a transient overlap among several coupled dimensions: liquid water availability, permissive temperature, ocean pH and salinity, access to bioessential elements, atmospheric shielding and volatile retention, and exposed or shallow environments that enable concentration, mineral catalysis, and wet\u2013dry cycling. During the Hadean\u2013early Archean transition, these dimensions were shaped by magma-ocean degassing, late accretion history, atmospheric compositional evolution from CO2-rich to more N2-dominated states, ferruginous ocean chemistry, tectonic recycling, continental growth, and intermittent land emergence. These processes created tradeoffs: high pCO2 may have enhanced abiotic nitrogen fixation but imposed hot and acidic conditions, whereas CO2 drawdown improved climate and ocean pH while weakening some fixed-nitrogen sources; ferruginous chemistry could locally enhance phosphate availability while also promoting nutrient scavenging; and tectonic recycling could stabilize the carbon cycle while generating chemically diverse but spatially intermittent land environments. We therefore frame life\u2019s origin as a planetary timing problem, in which prebiotic opportunities opened and closed as multiple environmental constraints came into and out of overlap. This perspective motivates coupled models that resolve when and where water, temperature, pH, nutrients, energy, atmospheric photochemistry, and exposed land surfaces jointly produced urable environments on Earth and other rocky planets.<\/jats:p>","DOI":"10.3390\/life16091436","type":"journal-article","created":{"date-parts":[[2026,8,28]],"date-time":"2026-08-28T18:33:52Z","timestamp":1787942032000},"page":"1436","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["The Emergence of an Urable Earth: How Early Planetary Evolution Shaped the Chemical Window for Life\u2019s Origin"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5478-0979","authenticated-orcid":false,"given":"Meng","family":"Guo","sequence":"first","affiliation":[{"name":"GAIA Lab, Department of Earth and Planetary Sciences, The University of Hong Kong, Hong Kong 999077, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zekun","family":"Meng","sequence":"additional","affiliation":[{"name":"GAIA Lab, Department of Earth and Planetary Sciences, The University of Hong Kong, Hong Kong 999077, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Siyu","family":"Liu","sequence":"additional","affiliation":[{"name":"Department of Physics, Hong Kong University of Science and Technology, Hong Kong 999077, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9513-0147","authenticated-orcid":false,"given":"Simon A. T.","family":"Redfern","sequence":"additional","affiliation":[{"name":"Asian School of the Environment, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore"},{"name":"Earth Observatory of Singapore (EOS), Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,8,28]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"25","DOI":"10.1038\/ngeo2025","article-title":"Evidence for biogenic graphite in early Archaean Isua metasedimentary rocks","volume":"7","author":"Ohtomo","year":"2014","journal-title":"Nat. Geosci."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"14518","DOI":"10.1073\/pnas.1517557112","article-title":"Potentially biogenic carbon preserved in a 4.1 billion-year-old zircon","volume":"112","author":"Bell","year":"2015","journal-title":"Proc. Natl. Acad. Sci. 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