- We do control clouds and cloud cover albedo [1].
- Human-induced changes to composition of earth's athmosphere result in about 3 Watts of additional heating per square meter of earth's surface [2]. That's almost 1% of the normal solar heating, or > 2K of (eventual) equalibrium temperature increase, so maybe we should call that "climate control" after all?
[1] https://www.faa.gov/about/office_org/headquarters_offices/ap...
Clouds are the result of the condensation of water on particulates in the atmosphere. Over 65% of Earth's surface area is liquid water. Oceans have deep currents that fluctuate in cycles and influence climate dramatically and have done so for billions of years and before humans even existed.
https://earthobservatory.nasa.gov/images/85843/cloudy-earth
This article by NASA covers that story well. "One study based on nearly a decade of satellite data estimated that about 67 percent of Earth’s surface is typically covered by clouds. This is especially the case over the oceans, where other research shows less than 10 percent of the sky is completely clear of clouds at any one time. Over land, 30 percent of skies are completely cloud free."
Cirrus clouds from airplanes could slightly influence local conditions, but would not even come close to having a global effect. The magnitude of change is not significant when compared to the ocean cloud cover.
At any rate, even something like cosmic ray flux can induce increase in cloud cover albedo as noted by Svensmark: http://apreat.ovh/henrik-svensmark-force-majeure-the-suns-ro...
From above "(the net effect of clouds is to cool the Earth by about 20–30 W/m2)" That is, clouds have an order of magnitude higher effect than trace greenhouse gases. That means even a 10% change in average cloud cover would more than exceed (on the downside) any radiative forcing caused by greenhouse gases. And this makes sense when you think about it. Clouds are capable of almost completely reflecting solar energy back into space.
This is where volcanism comes into play. When stratospheric injection of sulfates occurs from large volcanic explosions, an increase in cloud cover happens and a subsequent decrease in global temperatures occurs. This process we do not control, and volcanoes are perfectly capable of inducing ice ages on their own and we are powerless to stop that:
https://en.wikipedia.org/wiki/Year_Without_a_Summer
At any rate, NASA has admitted as much that our understanding and modeling of clouds and their effect on climate is extremely poor and that current climate models do not accurately account for their influence. Here's a great interview from JPL on that: https://www.youtube.com/watch?v=ra9AFNco3lI
You don't have to have full control over a complex dynamic system to wreak it.
Can you rephrase your argument?
In such a climate, earth would possibly not be able to sustain a large multi-billion human population.
We have already observed several periods in the modern climate era, the Holocene, that have been warmer than modern temperatures with nothing but positive implications for humanity during those times. These periods include the Medieval Warm Period (aligned with the Viking Age and the conquering of Iceland and Greenland), the Roman Warm Period (aligned with Rome's golden age) which saw the Mediterranean as being 2C hotter than modern temps [1], the Minoan Warm period (which was also a boomtime for humanity until the Santorini explosion plunged temperatures worldwide) [2] and of course the Holocene Climate Optimum (about 9000 to 5000 years before present, also associated with booms in human populations in China and elsewhere [3]. In fact, the most devastating events to occur to humans and life on earth tends to be associated with global plunge in temperatures, like the Younger Dryas event just before the onset of the Holocene, that saw temperatures plunge to ice age levels, and is associated with numerous extinctions. Cold episodes in earth's climate are really to be feared. They cause drought, famine, and widespread misery. Warmth and CO2 are good for plants. I hope we continue to warm, but Earth can always revert back into a glacial phase and we are powerless to stop it.
[1] Persistent warm Mediterranean surface waters during the Roman period https://www.nature.com/articles/s41598-020-67281-2
[2] Swedish tree rings provide new evidence in support of a major, widespread environmental disruption in 1628 BC https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/1999...
[3] https://www.sciencedirect.com/science/article/abs/pii/S10406...
[4] https://www.sciencedirect.com/topics/earth-and-planetary-sci...