{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.topic/1","content_sha256":"5c76f0b6461b8bf50d6ba9b49ac4538df1a118e9f29ff30d218fa1bdfa9bbc11","created":"2026-10-03T07:17:51Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":[],"salt":"b7150243c9920153a777aee791ac0a16ab66d50117bb3c92aaa8cd4b943bb938","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"topic"},"content":{"external_id":"earth.paleoclimate-puzzles","field":"earth","n":"1","review_cite":"G. Feulner, The faint young Sun problem, Reviews of Geophysics, 2012","review_link":"https://doi.org/10.1029/2011RG000375","review_verified":"true","summary":"Rocks, ice cores and seafloor mud record climates very different from today, from a warm early Earth under a dim Sun to planet-wide ice ages and sudden jumps in temperature. Several of these episodes still have no agreed explanation.","title":"Deep-time and glacial paleoclimate puzzles","topic_ref":null,"why":"Each puzzle is a test of how well climate physics and the carbon cycle are understood under forcings far outside the modern range."},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"4f250e50d442c2085fd7091e2a80ea67262938b9c04552ef688788b2ebee9449","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"ebac11cfb05674ac6434fa399cb5112856c01f38d9da8804df2bd920634980dd","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"mPr0Fd-BqRoeNdx-1HCLhYRrznHuXy-dEHXEB0eajslXvWg6Hd89nkB1fqnSemLpC3CQSFKqgCsuy3LGRxiOBg"},"schema":"pubphys.envelope/1"},"record_hash":"4f250e50d442c2085fd7091e2a80ea67262938b9c04552ef688788b2ebee9449","leaf_index":204}