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Over the past four billion years, 0.99 atm of nitrogen has been sequestered from the atmosphere into the crust via biological processes. If this were released today, it would nearly double the atmospheric pressure. Also, the onset of the runaway greenhouse effect will most likely be delayed to about 2 billion years from now due to this continuing further (instead of the 1.1 billion previously believed).
Ignoring of course that we'd be crushed, what would the increased heat and lower UV indices do if all of that nitrogen were to be released? 3/4? 2/3? 1/2? 1/3? 1/4? 1/5? 1/6? 1/10?
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