If we look at the graphs in post 63, I think #2 and #4 are too smooth to be accurate. The absence of noise suggests oversimplification to me, and makes me suspect the presenters' agendas.
Let's concentrate on #4, which can be determined to a high degree of precision from extant physical records, e.g. ice cores.
Here's your graph from bbc.co.uk ... it looks like a low-order polynomial fit; it's so smooth.
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Now here are other graphs covering the same time period. Note the features missing in the too-smooth curve, like the bobbles in the early 1800s, ~1925 and ~1950.
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Then there's this one ... different ordinate range, but now there's an outright inflection in the early 19th.
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These are datafrom the same narrow set, and presented differently, they evince completely different gut responses from the person looking.
So yes, I do think that graphs can lie even while not deviating (with apparent significance) from fact. cn
I don't necessarily have an issue with smoothing as long they aren't purposely manipulating the overall picture. However, I do have a problem with the first three charts showing a straight upward march for CO2 by leaving out the time when temperatures dropped and pulled CO2 down with it. Also, why 1744 as a starting point for CO2 charts that are from proponents of global warming? They always start at 1850/1880 for charts on temperature? It isn't because of lack of measurement, they get CO2 levels from a logical analysis of ice cores and such. Temperatures are derived in a no less scientific way.