Air Sourced Heat Pump.

davezawadi (David Stone):

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

• That atmospheric CO2 levels have increased over time

It has been much higher and much lower over history. It was about 6000 ppm in the Carboniferous period, it is about 420 ppm now,

• That the CO2 increase is due to human activity

It is indicated by the reference I gave earlier the CO2 level is not due to man. The level measured in Muna Loa, the global reference, has increased at exactly the same rate during Covid, although fossil fuel use has dropped about 25% for the period, this doesn't show AT ALL.

• That atmospheric CO2 levels impact global climate

Really, at 420 ppm any effect is tiny? The Earth didn't overheat when it was 6000 ppm, and all the coal seams were laid down because it makes vegetation grow extremely well. All the data is against this!

 

1) Yes, 350 million years ago CO2 levels were much higher. The global temperature was also about 6 degrees higher, despite the sun being less luminous then. In the last million years or so CO2 levels have varied between about 180-280 ppm, then in the last 200 years have shot up to 420 ppm. This is a sudden marked increase.


2) In the "wave power" thread a day or two ago you airily claimed 25% fossil fuel drop and and Muna Loa increasing at a constant rate. I asked for citations - you claimed it was somehow my responsibility to disprove your figures. So I went away and looked. I found a creditable source (Nature) that showed only 6% fossil fuel drop, and looked up the raw Muna Loa data showing a drop in the yearly increase rate in 2020 compared with 2019. You never replied to this. Instead you are still repeating your original assertions in this thread instead.


3) Of course the earth overheated at 6000 ppm. It was far hotter in the carboniferous than now. No one is claiming it got hot enough to destroy life, just that it was hotter, and that if a similar heat rise happened to the earth now, a lot of ecosystems would be damaged or destroyed to the sudden change in climate. (Just as an aside, the coal seams were laid down because trees had evolved, but there was then a long lag before suitable fungi/bacteria etc evolved which could process lignite, so most of the atmospheric CO2 got buried.)


You say that the 420ppm effect is tiny. In a way it is indeed tiny. Going from 280 ppm to 420 ppm CO2 is only going to increase global temperate from 287K to 289K or so. A tiny change! A mere 2 degrees! Note however that when the earth was a mere 4 degrees cooler, Boston was under a mile of ice.

davezawadi (David Stone):

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

• That atmospheric CO2 levels have increased over time

It has been much higher and much lower over history. It was about 6000 ppm in the Carboniferous period, it is about 420 ppm now,

• That the CO2 increase is due to human activity

It is indicated by the reference I gave earlier the CO2 level is not due to man. The level measured in Muna Loa, the global reference, has increased at exactly the same rate during Covid, although fossil fuel use has dropped about 25% for the period, this doesn't show AT ALL.

• That atmospheric CO2 levels impact global climate

Really, at 420 ppm any effect is tiny? The Earth didn't overheat when it was 6000 ppm, and all the coal seams were laid down because it makes vegetation grow extremely well. All the data is against this!

 

1) Yes, 350 million years ago CO2 levels were much higher. The global temperature was also about 6 degrees higher, despite the sun being less luminous then. In the last million years or so CO2 levels have varied between about 180-280 ppm, then in the last 200 years have shot up to 420 ppm. This is a sudden marked increase.


2) In the "wave power" thread a day or two ago you airily claimed 25% fossil fuel drop and and Muna Loa increasing at a constant rate. I asked for citations - you claimed it was somehow my responsibility to disprove your figures. So I went away and looked. I found a creditable source (Nature) that showed only 6% fossil fuel drop, and looked up the raw Muna Loa data showing a drop in the yearly increase rate in 2020 compared with 2019. You never replied to this. Instead you are still repeating your original assertions in this thread instead.


3) Of course the earth overheated at 6000 ppm. It was far hotter in the carboniferous than now. No one is claiming it got hot enough to destroy life, just that it was hotter, and that if a similar heat rise happened to the earth now, a lot of ecosystems would be damaged or destroyed to the sudden change in climate. (Just as an aside, the coal seams were laid down because trees had evolved, but there was then a long lag before suitable fungi/bacteria etc evolved which could process lignite, so most of the atmospheric CO2 got buried.)


You say that the 420ppm effect is tiny. In a way it is indeed tiny. Going from 280 ppm to 420 ppm CO2 is only going to increase global temperate from 287K to 289K or so. A tiny change! A mere 2 degrees! Note however that when the earth was a mere 4 degrees cooler, Boston was under a mile of ice.