The latest figures and weather consequences of global warming

[Remundo]

It was only COVID in 2020 that marked a small drop. Then it started to rise slightly again.

[izentrop]

this excess water that we have can probably be interpreted by higher oceanic evaporation, because it is stimulated by rising temperatures.

It is the greenhouse effect caused by excess CO2 which increases water vapor in the atmosphere. Steam which falls as rain here and which has the effect of causing very hot air to rise over south-eastern Europe.

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[Christophe]

Mr Simple is right on this point.

https://fr.statista.com/statistiques/56 ... jour-1998/

if it has fallen, it's marginal, I don't have the 2024 figures.

In France it is quite obvious: https://fr.statista.com/statistiques/48 ... le-france/

For the rest of the world we can clearly see the covid impact…

For the rest, I heard on the radio a few days ago that we were at 90 million…

[gildas]

Hello,
The causes of global warming and rising water levels could be similar to the video below (?).
Combustion engines = Combustion of oxygen in the air = Drop in pressure = Rise in water.

[Remundo]

combustion of O2 replaces O2 with CO2 and some H2O

the earth's atmosphere is not under cover, CO2 remains in the atmosphere and H2O is partly found in the gaseous state in the atmosphere as well.

The rise of the oceans is due to 2 main phenomena: the melting of continental ice and the thermal expansion of water.

The melting of ocean ice does not directly raise sea level, BUT replacing the albedo of the sea ice (very reflective) with that of deep water (very absorbent of solar rays), contributes to warming the climate, and to expanding the oceans.

[gildas]

Yes, the atmosphere is not under a cover, it is however held towards the ground by gravity...

[Remundo]

and yes but it has nothing to do with an undeformable volume.

That said, the question you raise is physically interesting, and I don't have a clear-cut answer to give at the moment.

For example if we consider the combustion of C8H18 + 12,5 O2 gasoline 8 CO2 + 9 H2O

We initially have 8 molecules of O2, which give 8 molecules of CO2

Regarding water, 9 H2O, if everything condenses, the atmosphere does not have more molecules after combustion, on the other hand if the Earth was very hot (say more than 100°C under 1 Bar), the 9 molecules of water would be gaseous in the atmosphere.

If we burn methane: CH4 + 2O2 CO2 + 2 H2O

Well, if the water is liquid, we have reduced the quantity of atmospheric gas by one molecule (again, considering that CH4 is not in the atmosphere initially).

As for the H2O liquid water produced, the quantity would have to be estimated to calculate the corresponding oceanic increase.

So there is no ready-made answer... even if it is probably quite marginal on atmospheric pressure.

O2 in the atmosphere is in very large excess compared to the hydrocarbons we burn, even if we are not economical!

[Christophe]

combustion of O2 replaces O2 with CO2 and some H2O

the earth's atmosphere is not under cover, CO2 remains in the atmosphere and H2O is partly found in the gaseous state in the atmosphere as well.

The rise of the oceans is due to 2 main phenomena: the melting of continental ice and the thermal expansion of water.

The melting of ocean ice does not directly raise sea level, BUT replacing the albedo of the sea ice (very reflective) with that of deep water (very absorbent of solar rays), contributes to warming the climate, and to expanding the oceans.

You forgot to specify that the hotter it gets, the more water is contained in the air...and this creates a "natural" feedback loop amplifying the greenhouse effect...

H2O is by far the number one greenhouse gas...

[Remundo]

I haven't mentioned everything, but in fact, there are several self-amplification reactions in global warming
* the melting of pack ice and continental ice replaces reflective surfaces with absorbent surfaces
* global warming evaporates more water into the atmosphere, H2O is a greenhouse gas
* global warming releases CO2 and CH4 from the oceans, which are GHGs
* global warming releases CO2 and CH4 from permafrosts

2 other more mixed factors, which are debated:
* the role of the clouds, if they are at low altitude, is rather warming, but those at high altitude, white and icy, are rather "cooling"
* the role of vegetation is uncertain, CO2 stimulates the growth of plants, but other factors can destroy them (flood, drought, storm, excessive temperature, etc.).

It’s a safe bet that the little we do with our anthropogenic GHG emissions will lead to a very strong shift in the climate in the centuries and millennia to come.

[Christophe]

Don't say too much: oil companies and other coal merchants (direct or indirect) could use all this as an argument to exonerate themselves from their faults...