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If the atmosphere's that sensitive to an 18ppm change in co2, we wouldn't be talking about this right now. we would be sweating bullets. >> so what you're 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 don't know. i don't think anybody really knows what kicked off that warming. there's lots of theories. one is that it was the final escape from a cold period, multi-century p...

208 parts per million. if it is that sensitive to 18ppm change in co2 we wouldn't be talking about this right now and we'd be sweating bullets. >> so what you're saying is man made carbon dioxide the last century could not have produced -- >> early 20th century. mark: could not have produced this heat. so what did? do we know? >> no. and three most important words in life may not be i love you. it may be i don't know. i don't think anybody really knows what kicked off that warming. there's lots of theories. one is that it was the final escape from a gold period, multicentury period known as th...

208 parts per million. if it is that sensitive to 18ppm change in co2 we wouldn't be talking about this right now and we'd be sweating bullets. >> so what you're saying is man made carbon dioxide the last century could not have produced -- >> early 20th century. mark: could not have produced this heat. so what did? do we know? >> no. and three most important words in life may not be i love you. it may be i don't know. i don't think anybody really knows what kicked off that warming. there's lots of theories. one is that it was the final escape from a gold period, multicentury period known as th...

Mother nature does naturally. if there is a human influence in there you wouldn't know it. there is natural variability. >> tucker: i know we keep good records on hurricanes going back more than 100 years. the data is available for anybody with goggle. we know if there is a dramatic increase. you stated the numbers for us. given that there hasn't been how can people claim there has been and global warming is to blame? >> i don't know. why do people like the "washington post" say such stupid things? it's because the people who are informing us in the media about globe warming are people like al...

Affecting. that we have a rise in sea levels around settled. that means storm surges begin at a higher level because the basic level is already slightly higher. we also notice a change in the species composition in the water and seeing national park. that may not be something tourists notice but those of us doing research here really see changes in the habitat. by the changes problematic. the term problematic is a very human viewpoint here to change is a part of life it's unstoppable that much is clear. on the one hand we have to consider how we can take climate protection measures where we ha...