18ppm Change News Today

If the atmospheres that sensitive to an 18ppm change in co2, we wouldnt be talking about this right now. we would be sweating bullets. >> so what youre saying is manmade carbon dioxide earlier in the last century could not have produced -- >> early 20th century. >> early 20th century, could not have produced this heat. so what did? do we know? >> no. three most important words in life may not be i love you. it may be i dont know. i dont think anybody really knows what kicked off that warming. th...