BBC News is running a story on a new study done by climate scientist in the US. Read the whold story here:
Global warming 'proof' detected. (Quotes around proof were in the original title.)

What exactly do we have here? What we have here is a data taken from measurements made by "a global flotilla of scientific buoys and floats" in the earth's ocean all over the globe, and plugged those numbers into a computer simulation.

Now, I know what your thinking, "Oh buoy boy, another computer simulation. My computer crashes once a week, can we really trust those simulations?"

Well, that's not easy to answer. As stated in the article: "any model can only be as accurate as the data which goes into it". You might have reasonably accurate temperature data, but what other kinds of factors do you add into your simulation? What kinds of things affect the way heat is trapped and/or released and are those factors really anthropogenic (human induced) or naturally occuring?

The fact of the matter is, you may think you have a computer simulalation that reasonably reflects (no pun intended) reality, but if some of your data is even slightly wrong, or you failed to include one or two important factors, your computer simulation could be spitting out data that is a lot less accurate than you realize. There are a lot of things that affect the way heat is trapped, and not all of them can be blamed on humans (check out this article). And as stated by sceptic William Kininmonth:

I do not believe this research team has made a compelling case to suggest that their computer models are sufficiently realistic to justify the implications of anthropogenic (human-induced) global warming that they make