dehammer: What do you mean by the "last global warming"?
The latest research indicates the little ice age and the medieval warm period weren't globally synchronous events, and were likely heavily influenced by oceanic circulation. Solar flares may produce a brief burst of energy, but how much have they really contributed to average insolation over the last few decades? Not enough to explain most of the warming trend, it would seem. And as I noted on another thread, the satellite temperature record is adjusted for bias from stratospheric cooling, an effect consistent with the amplified greenhouse effect.
Regarding your comment that it's "possible" future generations will appreciate our warming of the planet, your're assuming there will indeed be a major decrease in solar energy - something that seems far from substantiated. Meanwhile, the risks associated with a disruption of the carbon cycle during a long interglacial are great.
Besides, if we were to see a significant and clearly long-term trend of declining insolation, we could relatively easily step up our CO2 emissions in an attempt to avoid a big freeze. Contrast that with trying to put the CO2 genie, and it's feedbacks (including methane outgassing), back in the bottle.
Oh, and "weather models" aren't used in climate study and projection (see the first section after the intro
here ), and
climate models do indeed factor in total insolation, which includes any input from flares.
