ARRRGH! Brain melting!
You state three requirements to get you to 'believe' in global warming. The first is the existence of anthropogenic global climate change. You are, quite simply, wrong in thinking that this must be proven to exist.
I see you do not contend that the world is cooling, or staying the same temperature. I'll also assume you think the world is heating. There is, in fact, good evidence for this - Mars and Jupiter's temperature have gone up since we started shooting probes out there in the 70s. So let's just all agree that the earth, and the entire solar system is heating. (yes, sun, I am disappoint.)
Well, alright, we agree that the earth is heating, so I guess now we've got to prove that it's a bad thing. Would you like to tell me how any 'educated' guess about the future can be 'supported'? Face it, there are 100s of climate models running on computers around the world, and they all say that, yeah, CO2 will lead to sea level rise, and Bangladesh is screwed. End of story.
I'm not disagreeing with you that we should switch to nuclear (and solar, and wind...) power, but what you are doing by questioning anthropogenic global climate change does the entire world a disservice. Climate change has the ability to fuck up our grand kid's lives, and we need to do something about it, regardless if we (humans) caused this climate change or not.
I'd just like to add that people who do not understand the Carbon cycle are idiots. Taxing cow farts? Where does the Carbon in cow farts come from. grass? Wow, nice little closed cycle there. The reason we've (presumably) been screwing ourselves over is the digging up and burning of fossil fuels, and that's about it.