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1. the in (CO2) dioxide carbon of level The atmosphere .


2. million at 400 CO2 parts levels per were .


3. on the Earth This was when there were no humans .


4. warning Scientists 400ppm a the is sign say level .


5. above be would CO2, Pole South the at Even 400ppm .


6. gases that create global warming CO2 is one of the .


7. the One CO2 scientists of levels measuring .


8. ago levels 280ppm years CO2 around 300, were .


9. dangerous warming levels the Earth CO2 to is .


10. billions of This people will in put danger .