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Is the earth in imminent danger from water and heat damage? Yes? Do the thing(s) that will decrease those chances of water and heat damage.
It's pretty simple. Global warming is based on the effect greenhouse gases have on increases of temperature. Water vapor comprises 95% of all greenhouse gases. CO2 isn't even the strongest greenhouse gas. In other words, methane is about 23 times more effective in trapping heat in the atmosphere than CO2.
If we are in imminent danger of water and heat damage due to global warming, do all the things we can possibly do to retard greenhouse gases in the environment. Your argument of absolute vs. delta examines the changes of amounts of greenhouse gases as if that's most important. It isn't unless your ideology is man creates global warming. It isn't if we are in imminent danger of water and heat damage from global warming.
The change in greenhouse gasses is important because its the change in climate we're concerned with. The goal isn't "make earth as cold as possible" and I have no idea why you think it is. I also have no idea what you mean with the term "heat damage." We're not at risk of, like, burning, dude.
We want the earth's climate to remain as stable as possible. Surely that makes sense as a goal. Now, we don't actually have control over most of the major factors (solar activity, volcanoes, ENSO, orbital changes, etc) so instead we'll focus on the factors we do affect. Greenhouse gasses. Primarily, CO2 and methane as those are the ones we release in the largest quantities. Of the few dials we do have access to, it's wise to fiddle with them as little as possible, wouldn't you agree?
We could try to counteract natural changes. Sun goes up, we make CO2 go down. Sun goes down, we make CO2 go up. Try and balance things out to improve stability. Personally, I think we're a far cry from knowing enough to attempt geoengineering. It's too risky.
But wait. Geoengineering is exactly what we're doing, right this instant. We're cranking up on some of those dials right now.
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