I've been seeing a lot of posts around the whatever-we're-calling-ourselves-osphere recently expressing disbelief in human-caused climate change. And yes, Al Gore, and yes, inadequate modeling, and yes, collapse of the oil economy anyway, and yes, there's wars going on too, and so on, and so on. Come on, people.
No, the science is not complete. Science by definition never is. But the basics, the unavoidable facts, anyone can grasp, and they are as follows.
1. Energy can be converted from one form to another, but it can be neither created nor destroyed.
2. The Earth is essentially a closed system. Aside from the continual huge energy input from the sun, what we have is what we have. And it's a complex system to be sure, and variable, but its tendency is towards the development and sustenance of equilibrium.
3. That thing we call oil? This is what it is: vast quantities of energy, ultimately from the sun, our one significant source of input, which was gathered by biological systems (i.e., living things) and stored over billions of years.
4. We are currently towards the end of a process of releasing pretty much all of that energy in a couple of hundred years.
5. Complex systems (see #2) plus even a little bit of energy (and we're emphatically not talking about "a little bit" here) equals lots and lots of unpredictable chaos and catastrophic destruction of equilibria.
All of that energy, this billions of years worth of sunny days being spewed out into the world in a period lasting only a few hundred millionths of that time, has to go somewhere, and I can tell you this: the place it's going is not "away." The fact that we don't know exactly what the consequences will be is not a reason to stop worrying about it, it's exactly the opposite.
And yeah, we pretty much can't do anything about it. Since when has that been a reason to pretend that a problem doesn't exist?