Who says humans can't effect climate and temperature?

I'm tired of hearing this from idiots who can't be bothered to check anything out for themselves. Here's just a few events marked on a global temperature variation chart... there's plenty more, likely nearly every variation can be charted and connected to man made causes (such as wars) or natural causes (such as volcanoes), but what should be blazingly obvious to anyone is the undeniable fact that humans do indeed effect the environment, and rather profoundly at that.

Yes, it's a quick and dirty photoshop job... I hate using it. Perhaps sometime I'll make a better chart with more events, but this really should be enough to make the point.

Some noteworthy dips in temperature... the Tunguska event in 1908 which apparently threw a lot of dust into the atmosphere, causing a cooling period... this can also be seen on a smaller scale when Mount Saint Hellens errupted in 1980. These hardly compare to the obvious temperature drop after World War II, which most likely had a dual cause in the end of the massive amounts of frenetic activity during the war as well as atmospheric dust caused by the dropping of the atomic bombs.

As per thelicense, picture from Global Warming Art. Original found here.