Earth's atmospheric pressure is right for the lungs of human beings and for the mastery of fire as well. Our oxygen uptake is enabled, while combustion is also enabled without the threat of uncontrollable spread, because oxygen is 21% of our air.
During the Carboniferous period, earth's atmosphere was 30% oxygen. Even "wet forests" were subject to spontaneous combustion.
Our planet is the right size. Its gravity must retain heavier gases like nitrogen, oxygen, carbon dioxide, while at the same time not retaining hydrogen and helium.
On our planet there is only one species capable of manipulating fire, felling trees, creating charcoal to refine ores, etc. Human beings have the size, strength and intelligence for the job: "about 1.5 to 2 meters in height with mobile arms about one meter-long ending in manipulative tools." That tool, of course, is the wonderful human hand.
All these factors were essential to building the modern way of life that we all take for granted. If you pre-suppose a loving Creator, it makes sense.
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