Obviously, your initial views wouldn't have included beliefs about terms like "greenhouse gas forcing"

In my case this is wrong. Carbon dioxide absorbs infrared? Duh. The only change in my views since the beginning has been learning that the role of clouds is unclear (they may contribute some negative or positive feedback, depending on which types increase or decrease in prevalence). That increases the error bars for magnitude of warming, but that's in line with IPCC forecasts. Since solar forcing seems unlikely to change that much in the next few decades or centuries, anthropogenic changes to the atmosphere will be the main drivers of climate.

As to what to do about it, geoengineering looks like the best first line of defense, though that's an opinion I hold with great uncertainty. Unfortunately, ocean acidification won't be helped by (e.g.) making more clouds at sea (which could stabilize global temperature).