30 Gt a year is a substantial addition to the existing 700 Gt.
Answer me this- if man’s CO2 is different, and isn’t ‘two way’ then how does ANY of it make it back to earth?
Man's and nature's CO2 is not any different in any way. Nor is "new" CO2 different from "old" CO2. It is just CO2. There was a rough equilibrium at 280ppm. We have added 120ppm to that to reach 400 ppm. We are adding more so it is rising 2-3ppm per year. But the thing is, nature is absorbing about 1/20 or 1/30 of that "extra" CO2 (above the rough equilibrium) each year. That is going into the oceans.
Also you keep ignoring the facts that man’s contribution is just 0.0015% of the TOTAL ATMOSPHERE
That is not a fact at all. Without man we would be about 290 ppm (280 plus about 10 from the natural warming after the Little Ice Age). With man's contribution we are 400 ppm and rising. IOW mans's contribution is 0.012% (and rising).
Let’s be generous and assume 50% actually makes it’s way back towards earth- that works out to just 0.00007500000000000001% of the heat escaping earth making it’s way via back radiation, towards earth
Start with the 0.012% of the atmosphere and trap only 2% extra of the escaping heat, send 50% of that back (the 50% number is a constant). The total energy sent to space from the earth's surface is about 10^22 Joules. If 1% of that is sent back to earth that is 10^20 Joules sent back to earth. That is roughly the same as the energy consumed by mankind in all forms (fossil, nuclear, etc). A nontrivial amount of energy and I used conservative numbers.
You see where I’m going with this? It is such a small amount that it’s safe to say nearly ZERO heat gets back radiated due to man’s production of CO2 which amounts to only 0.0015% of the total atmosphere
The number is 0.012% and it takes 0.015% CO2 to prevent earth from being mainly frozen. Also, obviously, most plants would be dead at 0.015% or below (CO2 starvation).
We are in a geologically unique period on earth where CO2 could go low enough to wipe out life. Instead we have increased it from 0.028% to 0.04% and rising, thus preventing any slide into an ice age and plant death. it is a fact we should be celebrating.
[[That is roughly the same as the energy consumed by mankind in all forms]]
Man isn’t the only source of heat- infact he isn’t even a big player I nthat regard- so yes it is a trivial amount- and the atmosphere- man’s contribution, is 0.0015% not 0.012%- and I highly doubt 50% of the heat escaping earth gets trapped- you seemed to have missed the part about how insignificant the total amount of CO2 is compared to the total atmosphere- only a very tiny fraction of escaping/rising heat is trapped because there simply isn’t enough CO2 to absorb any significant amount- and of that tiny amount trapped- only a tinier amount gets back radiated I n the right direction towards earth- and even then, man is ‘responsible’ for an even tinier fraction of that TOTAL amount of ‘back radiated’ heat because man’s contribution is so insignificantly small as to be near zero-
[[We have added 120ppm to that to reach 400 ppm.]]
Not according to the studies and charts I listed-