So what's your research? What data did you take to make this conclusion? What are your hypotheses and theories regarding the current warming trend? Oh wait, you're just knee-jerking because you think we can't possibly have done it.
We can't make it rain? You've not heard of
cloud seeding, have you? No, we don't have the power to control the weather locally, because that involves some truly massive amounts of energy. Thing is, on a global scale, humanity throws out
truly massive amounts of energy. How much?
Everyone knows of the Mount St. Helens eruption from 1980. That eruption was fairly large (though not that large, sure): it released
24 megatons of energy in total. In 2008, humanity consumed
almost 144,000 TW-hours of energy. That's
5000 St. Helens eruptions every year, or 14 eruptions
per day. We consume INCREDIBLE amounts of energy, yet you believe that our exhaust fumes cannot possibly affect the climate? Volcanoes are known to be able to, though!
Note that this isn't meant to be a scientific proof or anything of the sort. You just seem to be unaware of the scale to which humanity has developed. Yes, we are most certainly able to affect the planet on a global scale, and that includes global warming. If you need another example, I'd just point at what global thermonuclear war would've done to the planet and leave it at that.
Oh, and you know what's one of the big flaws in your argument? There can be many causes for one consequence... It's well accepted that there are natural cycles of cooling and warming, but that doesn't preclude that other factors can also contribute to the global temperature, like humans. For someone so quick to throw out the tired old meme of logic "correlation does not mean causation", you sure seem fine with making major logical faults when they suit your perspective.