J
JimG
Guest
Maybe I’m missing something here. A quote from one of the previous links says this:
“Decreasing CO2 was the main cause of a cooling trend that began 50 million years ago, large scale glaciation occurring when CO2 fell to 450 +/- 100 ppm, a level that will be exceeded within decades, barring prompt policy changes.
If humanity wishes to preserve a planet similar to that on which civilization developed and to which life on Earth is adapted, paleoclimate evidence and ongoing climate change suggest that CO2 will need to be reduced from its current 385 ppm to at most 350 ppm.”
It says that global cooling occurred when CO2 fell below 450ppm. Then it goes on to say we must reduce CO2 from 385 to 350 to avoid global warming.
For the first figure it gives a plus or minus of 100ppm–quite a range of uncertainty, particularly when it is talking about mankind making a global effort to reduce CO2 by 35ppm.
If we happen to overshoot, do we bring on a new ice age? Is there some scientific hubris involved here?
Personally, I don’t want to be the one who has to tell the Chinese government that they must quit using coal-fired generating plants. Neither do I wish to be the one to tell all the rest of the world that we must all pay much higher prices for electricity, thereby hurting the poor the most.
“Decreasing CO2 was the main cause of a cooling trend that began 50 million years ago, large scale glaciation occurring when CO2 fell to 450 +/- 100 ppm, a level that will be exceeded within decades, barring prompt policy changes.
If humanity wishes to preserve a planet similar to that on which civilization developed and to which life on Earth is adapted, paleoclimate evidence and ongoing climate change suggest that CO2 will need to be reduced from its current 385 ppm to at most 350 ppm.”
It says that global cooling occurred when CO2 fell below 450ppm. Then it goes on to say we must reduce CO2 from 385 to 350 to avoid global warming.
For the first figure it gives a plus or minus of 100ppm–quite a range of uncertainty, particularly when it is talking about mankind making a global effort to reduce CO2 by 35ppm.
If we happen to overshoot, do we bring on a new ice age? Is there some scientific hubris involved here?
Personally, I don’t want to be the one who has to tell the Chinese government that they must quit using coal-fired generating plants. Neither do I wish to be the one to tell all the rest of the world that we must all pay much higher prices for electricity, thereby hurting the poor the most.