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To: sm1th who wrote (46481)	6/20/2013 4:14:50 PM
From: FJB	1 Recommendation Recommended By Brumar89 Read Replies (1) \| Respond to of 85487

The following summarizes levels of CO2 under various conditions: 40,000 ppm: The exhaled breath of normal, healthy people. 8,000 ppm: CO2 standard for submarines 2,500 ppm: CO2 level in a small hot crowded bar in the city 2,000 ppm: The point at which my CO2 meter squawks by playing Fur Elise 1,000 to 2,000 ppm: Historical norms for the earth's troposphere over the past 550 million years 1,000 to 2,000 ppm: The level of CO2 at which plant growers like to keep their greenhouses 1,000 ppm: Average level in a lecture hall filled with students 600 ppm: CO2 level in my office with me and my husband in it 490 ppm: CO2 level in my office working alone 390 ppm: Current average outdoor level of CO2 in the air 280 ppm: Pre-industrial levels in the air, on the edge of "CO2 famine" for plants 150 ppm: The point below which most plants die of CO2 starvation