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Let's be blunt. The Earth's atmosphere is leaking at a very, very slow rate. Researchers say this has been going on for a very long time. Professor Ian Pilmer of Adelaide University and Professor Jon Harrison of the University of Arizona estimated that, at one point, the atmosphere's oxygen content was around 30 percent. Today, the atmosphere is around 78 percent nitrogen, 21 percent oxygen, .9 percent argon, and .03 percent carbon dioxide.
What can explain this? Sometimes, it can be a simple and natural process in which the gases in the atmosphere become overheated by the sun, holes emerge in the atmosphere, and the gases just burn off through those openings. Earth, unlike Mars and other planets, is wrapped in a magnetic shield that protects it from the sun's damaging heat and solar winds. This is a great buffer against atmosphere deterioration, but it does not eliminate it entirely. Our planet is losing atmospheric molecules at roughly a rate of 5x1025 power. It's actually faster than Mars' atmospheric loss rate, according to a presentation given at the European Geoscience Union General Assembly meeting in 2013.
Revealed: How Mars Lost Its Atmosphere (Time)
"The Curiosity rover has been on the Red Planet for almost a year now, and the landing itself - an outrageous feat achieved by a stationary hovercraft that lowered the 1-ton Mars car to the surface by cables - was a global television event."
Losing air: Barrage of small impacts likely erased much of the Earth's primordial atmosphere (Science Daily)
"Researchers believe a blitz of small space rocks, or planetesimals, may have bombarded Earth around the time the moon was formed, kicking up clouds of gas with enough force to permanently eject small portions of the atmosphere into space."