... well. Riight.  Six times 400ppm would be 2400 ppm, or a 2000ppm increase. At 2ppm/yr, that's 1000 years worth.  Wasn't it Laugh-in with the line, "Veerrry interestink............., but schtupid"? You said it. For something less "schtupid", consider that the growth rate of fossil fuel usage isn't zero. Also, consider that even sub-lethal climate ...

..., as well. Riight. Six times 400ppm would be 2400 ppm, or a 2000ppm increase. At 2ppm/yr, that's 1000 years worth. Wasn't it Laugh-in with the line, "Veerrry interestink............., but schtupid"? You said it. For something less "schtupid", consider that the growth rate of fossil fuel usage isn't zero. Also, consider that even sub-lethal climate ...

... do, as well. Riight. Six times 400ppm would be 2400 ppm, or a 2000ppm increase. At 2ppm/yr, that's 1000 years worth. Wasn't it Laugh-in with the line, "Veerrry interestink............., but schtupid"? You said it. For something less "schtupid", consider that the growth rate of fossil fuel usage isn't zero. Also, consider that even sub-lethal climate change ...

... to do, as well. Riight. Six times 400ppm would be 2400 ppm, or a 2000ppm increase. At 2ppm/yr, that's 1000 years worth. Wasn't it Laugh-in with the line, "Veerrry interestink............., but schtupid"? You said it. For something less "schtupid", consider that the growth rate of fossil fuel usage isn't zero. Also, consider that even sub-lethal climate change might not be ...