@Flofflewoffle Temperature on earth was not always as cold as we are used to. There have been periods with much warmer climate.
https://upload.wikimedia.org/wikipedia/commons/5/5f/All_palaeotemps.svg
https://en.wikipedia.org/wiki/Geologic_temperature_record
https://en.wikipedia.org/wiki/Faint_young_Sun_paradox
https://upload.wikimedia.org/wikipedia/commons/5/5f/All_palaeotemps.svg
https://en.wikipedia.org/wiki/Geologic_temperature_record
https://en.wikipedia.org/wiki/Faint_young_Sun_paradox
6 billion bc - 2020