Historic Low of sub ppm CO Levels  Shouldnt it be mentioned somewhere that at  ppm today we are at an historic low of CO concentrations when we look back at past CO levels The only other time CO has dropped below  ppm has been the late Carbiniferous some  million years ago but at all other times CO has been above  ppm The graph here httpwwwgeocraftcomWVFossilsCarboniferousclimatehtml shows CO levels with a black line and temperature is the blue line In fact its been as high as  ppm during the Cambrian period which was so favorable to life that it resulted in the famous Cambrian Explosion an explosion of biodiversity This seems to contradict the predictions that our  ppm level will result in dire consequences for life Its a basic crime of omission by leaving these facts out