Anthropic Constant 1: Oxygen Level
On earth, oxygen comprises 21 percent of the atmosphere. That precise figure is an Anthropic Constant that makes life on earth possible. If oxygen were 25%, fires would erupt spontaneously, if it were 15%, human beings would suffocate.
Anthropic Constant 2: Atmospheric Transparency
If the atmosphere were less transparent, not enough solar radiation would reach the earth’s surface. If it were more transparent we would be bombarded with far roo much solar radiation down here. (In addition to atmospheric transparency, the atmospheric composition of precise levels of nitrogen, oxygen, carbon dioxide and ozone are in themselves Anthropic constants).
Anthropic Constant 3: Moon-Earth Gravitational Interaction
If the interaction were greater than it currently is, tidal effects on the oceans, atmosphere, and rotational period would be too severe. If it were less, orbital changes would cause climatic instabilities. In either event, life on earth would be impossible.
Anthropic Constant 4: Carbon Dioxide level
If the CO2 level were higher than it is now, a runaway greenhouse effect would develop (we’d all burn up). If the level were lower than it is now, plants would not be able to maintain efficient photosynthesis (we’d all suffocate).
Anthropic Constant 5: Gravity
If the gravitational force were altered by 0.00000000000000000000000000000000000001 percent, our sun would not exist, and, therefore neither would we. Talk about precision.
Anthropic Constant 6: Centrifugal Force If the centrifugal force of planetary movements did not precisely balance the gravitational forces, nothing could be held in orbit around the sun.
Anthropic Constant 7: Rate Of Expansion
If the universe had expanded at a rate one millionth more slowly than it did, expansion would have stopped and the universe would have collapsed on itself before any stars had formed. If it had expanded faster, then no galaxies would have formed.
Anthropic Constant 8: Speed Of Light
Any of the laws of physics can be described as a function of the velocity of light (now defined to be 299,792,458 meters per second). Even a slight variation in the speed of light would alter the other constants and preclude the possibility of life on earth.
Anthropic Constant 9: Water Vapor Levels.If water vapor levels in the atmosphere were greater than they are now, a runaway greenhouse effect would cause temperatures to rise too high for human life. If they were less, an insufficient greenhouse effect would make the earth to cold to support human life.
Anthropic Constant 10: Jupiter.
If Jupiter were not in it’s current orbit, the earth would be bombarded with space material. Jupiter’s gravitational field acts as a cosmic vacuum cleaner, attracting asteroids and comets that might otherwise strike earth.
Anthropic Constant 11: The Earth’s Crust.
If the thickness of the earth’s crust were greater, too much oxygen would be transferred to the crust to support life. If it were thinner, volcanic and tectonic activity would make life impossible.
Anthropic Constant 12: The Earth’s Rotation.
If the rotation of the earth took longer than 24 hours, temperature differences would be too great between night and day. If the rotation period were shorter, atmospheric wind velocities would be to great.
Anthropic Constant 13: Axis Tilt.
The 23-degree axis tilt of the earth is just right. If the tilt were altered slightly, surface temperatures would be too extreme on earth.
Anthropic Constant 14: Atmospheric Discharge.
If the atmospheric discharge (lightning) rate were greater, there would be too much fire destruction; if it were less there would be little nitrogen fixings in the soil.
Anthropic Constant 15: Seismic Activity.
If there were more seismic activity, much more life would be lost; if there were less, nutrients on the ocean floors and in river runoff would not be cycled back to the continents through tectonic uplift. (yes, even earthquakes are necessary to sustain life as we know it).
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