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It was 50 years ago today, that a young American scientist, Charles David Keeling,

It was fifty years ago today

when David Keeling first began to play

He's been goin' in an out of style

While exaggerating by a mile

Now let me indoctrinate poor you

with the ACT we've known for all these years

Goron's Crazy Loony Tune's Club Band

With respect to posts 10-11-12. There is NOTHING wrong with Keeling's measurements. They have been replicated many times over, all over the globe. They just started at Mauna Loa because it was not impacted by nearby industrial sites.

The EFFECT of the increse in CO2 is very shaky, but the fact of the increase is not. The CO2 level is, of course, very tiny as a part of all the atmosphere, going from maybe 280 parts per million to around 360-370, leaving 999,630 parts per million that are not.

Second, all of the recent historical evidence (cores, tree rings, etc) shows no changes in, say, the last 2000 years until recently (The big swings in geological time are very important for analysis, but they are much further back than that.) So, the sources of natural CO2 are very large, but have always (within last couple of millenia) balanced with the natural removal.

So, it's no good saying that man isn't causing the rise in the CO2 level in the atmosphere. It's the effect of that rise, if any, that is in serious dispute.

If you read the fine print of even the IPCC reports, they admit that, even by their arguments, there is some chance that no warming is happening, and an even greater chance that man isn't responsible for all, or even most, of it.

Some of the most prominient "skeptics", like Dr. Fred Singer, say that warming is clearly happening, but it isn't caused by man.