CO2 ppm, sun and climate variability

[sicetaitsimple]

You can't these days "limit your debate to the natural climate",

Actually, that doesn't mean much. Whether it is “original”, “natural”, or of anthropogenic origin, the CO2 present in the atmosphere does not care. The molecules are not “marked”

[izentrop]

The molecules are not “marked”

http://acces.ens-lyon.fr/acces/formatio ... -profs.pdf

In 2010: https://gml.noaa.gov/outreach/isotopes/index.html

[sicetaitsimple]

OK, I should have written 'molecules are not individually marked

[izentrop]

Sorry but isotopic analysis shows that they are individually marked. A carbon atom from fossil fuels is clearly distinguished by its low proportion of 14C

[sicetaitsimple]

Sorry but isotopic analysis shows that they are individually marked. A carbon atom from fossil fuels is clearly distinguished by its low proportion of 14C

Ok, I read the article, interesting... But I give you a CO2 molecule taken from the air at random, are you (or someone else) able to determine its origin? No...

[Ahmed]

...and the worst part is that its origin has absolutely no importance!

[sicetaitsimple]

...and the worst part is that its origin has absolutely no importance!

yes, that's a bit what I wrote above:Whether it is “original”, “natural”, or of anthropogenic origin, the CO2 present in the atmosphere does not care.

[izentrop]

...and the worst part is that its origin has absolutely no importance!

Great on the contrary for scientists. I don't understand why interest escapes you

This allows researchers, by analyzing an air sample, with a mass spectrometer, to determine the origin of the CO2 contained and thus be able to demonstrate the fossil and "natural" part, table that I put a little above

And many other inventories https://gml.noaa.gov/outreach/isotopes/c14tellsus.html
The history of CO2 https://gml.noaa.gov/outreach/isotopes/mixing.html
Local air pollution status https://gml.noaa.gov/outreach/isotopes/sampling.html

ext...

The relative proportion of 13C in our atmosphere is steadily decreasing over time. Before the industrial revolution, δ13The C of our atmosphere was around -6,5‰; Now the value is around -8‰. Remember that plants have minus 13C relative to the atmosphere (and therefore have a more negative δ13C of around -25‰). Most fossil fuels, such as oil and coal, which are ancient plant and animal materials, have the same δ13C isotopic as other plants. The annual trend, i.e. the overall decrease in atmospheric δ13C– is explained by the addition of carbon dioxide to the atmosphere which must come from the terrestrial biosphere and/or fossil fuels. In fact, we know from Δ14C measurements, inventories and other sources, that this decrease is due to fossil fuel emissions, and is an example of the Suess effect.

https://gml.noaa.gov/outreach/isotopes/c13tellsus.html

[Ahmed]

The origin of CO2 has no influence on its absorption by plants, any more than on the greenhouse effect; that scientists are upset by this, I readily admit, but as nothing will come of these results in practice...

[izentrop]

If it provides additional evidence to convince skeptics who are not resistant to science and precise data to follow the evolution of policies to combat RC.

We cannot therefore say that "nothing will result in practice..."