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6/14/2025, 9:02:29 AM
>>712610409
>This means that an early sun would have been fainter, warming the earth 31°F (17°C) less than it does today. That’s below freezing.
This is based on the false assumption that conditions on Earth were essentially the same billions of years ago as they are now. An atmosphere more rich in carbon dioxide and other gasses that trap heat have a greater effect on Earth's surface temperature than a small variation in the amount of sunlight the planet is receiving, as can be seen from the extreme example of Venus.
Also, even a significant reduction in Earth's surface temperature (as during the regular cycle of Ice Ages) does not imply that the Earth would ice over from pole to pole, let alone the oceans freezing entirely. Some scientists speculate that a "Snowball Earth" scenario where ice caps extend to the equator has happened in the past, but even then it did not represent an existential threat to life that thrived on heat and nutrients from deep ocean thermal vents. It is known that there are other bodies FAR colder than Earth which could still have oceans of water underneath miles of ice.
>This means that an early sun would have been fainter, warming the earth 31°F (17°C) less than it does today. That’s below freezing.
This is based on the false assumption that conditions on Earth were essentially the same billions of years ago as they are now. An atmosphere more rich in carbon dioxide and other gasses that trap heat have a greater effect on Earth's surface temperature than a small variation in the amount of sunlight the planet is receiving, as can be seen from the extreme example of Venus.
Also, even a significant reduction in Earth's surface temperature (as during the regular cycle of Ice Ages) does not imply that the Earth would ice over from pole to pole, let alone the oceans freezing entirely. Some scientists speculate that a "Snowball Earth" scenario where ice caps extend to the equator has happened in the past, but even then it did not represent an existential threat to life that thrived on heat and nutrients from deep ocean thermal vents. It is known that there are other bodies FAR colder than Earth which could still have oceans of water underneath miles of ice.
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