Air Sourced Heat Pump.

davezawadi (David Stone):

I'll answer those but the reference given is good...

High CO2 levels in the carboniferous are fact, though most references I found in a brief search give 1500-3000 ppm, falling towards more like 350 ppm towards the end of the period. It's important to note that whilst the Earth was "fine" that does not mean the climate was suitable for humans (who start to suffer health problems at around 2000 ppm), or indeed any mammals at all. It certainly does not imply that it would be possible to farm modern food crops under carboniferous conditions or that sea levels would be consistent with those to which we are accustomed. The carboniferous period ended nearly 300 million years ago, humans have only been around 1/1000th of that time and CO2 levels have been under 300 ppm for several times longer than humans have been here.


Given the seasonal variation in CO2 levels, and the general noisiness in the data, I would not have expected to see the effect of a 25% change for a single year. Isotope ratios also provide clear evidence that the carbon being added to the atmosphere is ancient, do you have a plausible alternative hypothesis as to its source? Or indeed for where the carbon that we evidently do emit is going?


@Jon, it is somewhat inconsistent to refer to Dr. Roy Spencer as "a nasa scientist" (which he is), and make that argument from authority without also acknowledging that the position of NASA as a whole is that anthropogenic climate change is real and supported by evidence.


We've gone off-topic a little.

davezawadi (David Stone):

I'll answer those but the reference given is good...

High CO2 levels in the carboniferous are fact, though most references I found in a brief search give 1500-3000 ppm, falling towards more like 350 ppm towards the end of the period. It's important to note that whilst the Earth was "fine" that does not mean the climate was suitable for humans (who start to suffer health problems at around 2000 ppm), or indeed any mammals at all. It certainly does not imply that it would be possible to farm modern food crops under carboniferous conditions or that sea levels would be consistent with those to which we are accustomed. The carboniferous period ended nearly 300 million years ago, humans have only been around 1/1000th of that time and CO2 levels have been under 300 ppm for several times longer than humans have been here.


Given the seasonal variation in CO2 levels, and the general noisiness in the data, I would not have expected to see the effect of a 25% change for a single year. Isotope ratios also provide clear evidence that the carbon being added to the atmosphere is ancient, do you have a plausible alternative hypothesis as to its source? Or indeed for where the carbon that we evidently do emit is going?


@Jon, it is somewhat inconsistent to refer to Dr. Roy Spencer as "a nasa scientist" (which he is), and make that argument from authority without also acknowledging that the position of NASA as a whole is that anthropogenic climate change is real and supported by evidence.


We've gone off-topic a little.