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A greenhouse traps its IR/ LWR with its glass enclosure. The UV comes in, warms the interior which starts radiating and that radiation is trapped by the enclosure. Simple, basic stuff.
According to at least some AGW alarmists CO2 acts like a blanket. Clouds can act like a blanket depending on the type and abundance. But that blanket just keeps the norm. It doesn't make it any warmer.
CO2 is heavier than air. The miniscule traces of CO2 are nothing like cloud cover and nothing like a blanket.They re-emit their absorbed energy in any direction, not just back towards the source, for example the earth. If all of the CO2 aligned such that their collective re-emittance was towards space then there is zero greenhouse effect. It wouldn't matter if the atmospheric CO2 concentration was 1% if that was the case. And at 400 parts per million, even if you could get them all aligned to re-emit towards the earth, it's a very inefficient process that includes cooling when the energy is released.
And guess what? All of that energy escapes anyway.
The fact is neither scenario is likely. That is because the CO2 is constantly being moved around and with that the angle of re-emittance is always changing. And the area the re-emitted energy can affect is very small. Unless the CO2 is very close to the earth there is no way its re-emitted energy will reach the earth. It's most likely going to get moved right along by winds and convection currents. That is how the majority of the heat the atmosphere is moved- winds and convection currents. The re-emitting from CO2 is very, very minor in comparison and is overwhelmed by it.
CO2 only absorbs 8% of the total black body radiation produced by the earth. 8%- that's it. 92% leaves unimpeded by CO2. That is a number you will never hear AGW alarmists say.
How long does the CO2 hold onto the energy? Not long at all. It gets energized and gives it away- badda-bing, badda-boom- gone. Some of it's energy is transferred via contact with other atmospheric gasses. Only some of it's absorbed energy is re-emitted as IR/ LWR. You are not going to get warmer if the energy the CO2 releases is less than the surrounding air.
How far does that re-emitted energy travel? It isn't powered by much so it cannot be very far before it dissipates without leaving any noticeable effect.
Then there is the following:
Determination of the Total Emissivity of a Mixture of Gases Containing 5% of Water Vapor and 0.039% of Carbon Dioxide at Overlapping Absorption Bands.
Conclusions
This assessment demonstrates that the effect of an increased warming caused by an increase of absorptivity of infrared radiation (IR) by water vapor due to overlapping spectral bands with carbon dioxide does not happen in nature.
On the overlapping absorption spectral bands of carbon dioxide and water vapor, the carbon dioxide propitiates a decrease of the total emissivity/absorptivity of the mixture in the atmosphere, not an increase, as AGW proponents argue 1, 2, 3.
Applying the physics laws of atmospheric heat transfer, the Carbon Dioxide behaves as a coolant of the Earth’s surface and the Earth’s atmosphere by its effect of diminishing the total absorptivity and total emissivity of the mixture of atmospheric gases.
What? How can that be? HINT- CO2 is being used as a commercial refrigerant- it is a high quality natural refrigerant. Go figure.
Without an atmosphere the surface would be roasting. The Moon doesn't have an atmosphere and guess what the sunny side's temperature is? 253 degrees F!!!!!
NASA
It is our magnetic shield, atmosphere and
oceans which greatly attenuate and regulate that signal. The greenhouse gasses, mainly water vapor just slow the return of the energy back into space. Deserts are cold at night due to the lack of humidity and total lack of cloud cover. CO2 doesn't have any effect there.
Urban heat islands exist as do
Urban CO2 domes. Looks like the gasses don't mix as much as we are led to believe which would make CO2 a local and not global issue. IF it was an issue to begin with, which apparently it is not.
CO2 does not act like a blanket. It does not trap any heat. All the alleged greenhouses gasses do is slow the ascent of the radiated heat from the surface of the earth to space.