Everyone knows that stuff like Co2 warms the atmosphere (shocking I know). But I recently heard that if there was none of the natural Co2 we already have, the average temperatures on earth would be around -15 degrees Celsius (could be wrong about that number). I would assume that this is not ideal for life, and if this is the case, is Earth really in the habitable zone, or is it just habitable because of the greenhouse gases in the atmosphere that make it warmer? Is the variablity of the amount of greenhouse gases accounted for when calculating how big the band of the zone of habitability?
Edit: Got my answer, thanks everybody!
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To answer the somewhat underlying second question about greenhouse gasses, it’s important to remember that greenhouse gas emissions are not entirely man made. The atmosphere containing these greenhouse gasses is definitely a part of how our planet is survivable and there are natural ways these gasses are created.
Of course that doesn’t excuse the fact that we humans can over produce them, but the presence of CO2 isn’t itself a bad thing and yes that contributes to why we can survive on earth.
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