> Much (if not most?) of Earth's history has been without any ice caps, so it's not like this state will lead to a Venus-like Earth. But much of Earth's histor

> Much (if not most?) of Earth's history has been without any ice caps, so it's not like this state will lead to a Venus-like Earth. But much of Earth's history has been without land plants too. They appeared only after 90% of Earth history already passed: only 450 million years ago. Earth exists for 4.5 billion years. (Also to compare, we started burning gasoline after 99.999997% of the Earth history already passed, and managed to burn during that small time period the half of all easily reachable oil in the Earth crust! For which the Earth needed... effectively all 4.5 billion years to manage to accumulate there. The size of what we did is mind-boggling on so many levels. Ah, yes, also during much of the Earth history there was effectively no oxygen in the atmosphere: it appeared in "breathable" quantities only after 77% of the current Earth's age already passed, if the Earth would be a 90-year-old lady: the oxygen exists only since she was 70, plants since she's 81, and we burned the half of easily reachable oil in only the last 1 minute 34 seconds)