Alternative to climate change that is warming would be that which is cooling.
Do we really want to try tripping the next Ice Age via geo-engineering?
Is a slightly warmer average global climate really as bad as a much colder one, especially if it pushes closer to an Ice Age?
I didn't see anyone advocating geo-engineering. Besides, if you don't like geo-engineering, why do you seem to have no problem with pushing the Earth's GHG levels up almost 50%?
I don't see humans pushing water vapor up by 50% and that's about 99+% of your GHG, if being honest.
Other GHG is CO2 at 0.04% of dry; or 400ppmd = 1/2500 ratio to nitrogen, oxygen, argon, etc. Even if we got to 50% more, that is still lower than what the planet has experienced in most of the past 4+ billion years.
Methane is about 0.000004% or 4ppbd, that's b=billions.
If one is saying "we have do do something" about/correcting/altering "climate change/global warming", especially anthropogenic, than that is Geo-engineering.
BTW, the "anthropogenic" part of CO2 is only about 1/3 over the recent natural levels and those barely sustain the flora.
Best solutions are to adapt and be thankful we aren't plunging into another Ice Age, which is about due given trends of past half million years.