A mistaken asserion
"Of course, we now know that real greenhouses preserve warmth not by trapping infrared radiation but by physically obstructing the convective heat exchange between a greenhouse interior and the exterior environment. "
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It is a mistaken assertion though. The real-time observations on the real greenhouses thermal behavior dynamic reveals the quite the opposite.
The real greenhouses do preserve warmth by trapping infrared radiation. The glass or plastic covering do not let the infrared radiation out.
The air in the real greenhouses is the same transparent to solar rays medium. The air doesn't get warmed by the solar EM energy. Air in greenhouses gets warmed from the contact with warmer surfaces.
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Solar energy when hitting matter doesn't get absorbed (minus reflection) it doesn't get absorbed in its entirety.
Only a small portion gets absorbed as heat. There is a strong immediate IR emission by-passing the phase of absorption as heat.
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Earth's global temperature rises and falls in cyclical way, because Earth is a planet rotating on its axis, and also Earth orbits sun.
Thus the planetary temperature is an orbitally determined value.
The fossil-fuels burning has nothing to do with global temperature.
Yes, CO2 is a greenhouse gas, but its content is insignificant - CO2 trace gas content doesn't influence global temperature.
A real greenhouse is covered with glass. Glass (minus reflection) lets solar energy in the greenhouse, glass lets the reflected solar energy out of the greenhouse, but glass doesn't let out the immediate IR emissions, because they are of lower frequensies.
That is why real greenhouses accumulate solar energy as heat, that is why the real greenhouses' temperature rises.
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When reflected from the glass or plastic coverings, the greenhouses' immediate emissions IR EM energy is subjected to multiple interactions with solid materials (the ground and other surfaces), till it is completelly gets transformed and absorbed as heat and eventually rising the real greenhouses' inner temperature above the outside ground temperature.
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