> has been proven to work and be life sustaining for millions of years This statement is wrong for a few reasons. Firstly, this is a system that repeatedly pro

> has been proven to work and be life sustaining for millions of years This statement is wrong for a few reasons. Firstly, this is a system that repeatedly produces minor ice ages that transform large portions of continents into barren ice deserts for tens of thousands of years. It is also capable of producing major ice ages that last millions of years and cover large portions of the entire Earth in ice and this happens if there isn't enough CO2 in the atmosphere. Not exactly life sustaining. Secondly, ice, the climate that produces it and the Earth at large have no concern for the life that lives upon or within them. They are decidedly unforgiving and will kill any lifeform that doesn't fight for its life against them. Life exists in spite of the abiotic world and in direct conflict with its perpetual slide towards entropy. Given a long enough timeline this system will change into a state that is largely hostile towards human life. It is a massive misnomer to call it life sustaining.