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I'm sure that you've been told that greenhouse gases put out by evil humans trap and retain heat, right? It's very possible (and even likely) that the buffering effect of both the massively huge atmosphere and massively huge oceans could mediate any affects that we could cause.
Further, there is no real, genuinely proven trend of man-made global warming. Depending on who you ask, people will tell you the it's either people, or Nature, that puts out more greenhouse gases.
I'm not being a fool. *Global warming* is real. Just not greenhouse gas global warming. Global warming cycles have been well documented through fossil records, sediment records, ice core records, and direct scientific observations for the past 500 or 600 years. Further, well-observed, accurate, calculated, predictable and completely natural perturbations in our orbit bring us closer to and farther from the Sun (the Milankovitch Cycles). All of these things act together to give us warm-cold-warm cycles over time-spans of millions of years, hundreds of thousands of years, tens of thousands of years, a few thousand years, a to a few centuries, and on a very small scale, even decade cycles. It's natural, it happens, and all of our records show that it's happening, and it's supposed to be happening right now. When our ancient ancestors were walking around Europe, conditions sucked. It was cold. Now we're more comfortable. For people who don't believe scientific data, they can pull out a geography book or a copy of National Geographic from the early 20th Century, look at a pretty picture of where a certain glacier or ice cap was, then take a comfortable drive to see where that same glacier is now - it has retreated, because it is melting. If the climate wasn't changing, it would have been at equilibrium, either not moving, or continuing to grow. More heat means more melt. Global warming is fact.
Now what you *can* debate is whether or not greenhouse gases are the problem. Global warming *may* happening much faster than we think that it "should." Some people think that it's actually accelerating in a way that we don't think think it should, although the time period of measurement is far to small to really know. We know that those gases do what we blame them for, under laboratory conditions. But do they work the same way in nature? Can we even put out enough of these gases all by ourselves to cause the acceleration problem? Or is this perhaps also just a normal thing that acts so quickly that our reference materials couldn't pick it up? After all, observing 20 or 30 years on a serious basis is barely a blip over the geologic record.
So don't just listen to people yelling, "EMISSIONS!!!" Do some research. Global warming, yes. Human greenhouse gases, that still remains only, "perhaps." Anyone who doesn't allow for that, as our research period is so incredibly short -- those people are narrow-minded fools.
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