08-10-2014, 06:26 AM
Note that nitrogen-rich atmospheres are likely to be very common among terrestrials. Nitrogen is an atmophile element, more likely to be found in an atmosphere or as ammonia than as part of a planet's crust. Human colonists after the middle First Federation period were regularly given minor tweaks to avoid irritations like nitrogen narcosis and carbon dioxide poisoning, significantly increasing the number of planets that could be settled.