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Earth's CO2 Passes the 400 PPM Threshold – Maybe Permanently

• poiuyt12 10y ago
  (i) Water vapor is the most significant GHG. (ii) CO2 GH effect saturates at higher concentrations. (iii) More CO2 means a greener, more drought-resistant world. Green Sahara, anyone? (iv) Runaway heating scare assumes an unproven and unphysical "positive feedback" between H2O and CO2.