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Atmospheric CO2 Concentrations At 400 PPM Are Still Dangerously Low For Life On EarthWe almost lost the entire plant life on earth during the last ice age - it's time to panic! http://notrickszone.com/2013/05/17/atmospheric-co2-concentrations-at-400-ppm-are-still-dangerously-low-for-life-on-earth/ |
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