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All of the charts should use the same time scale. It's confusing and misleading to use different scales for each.

The argument for doing it is likely because that's all the good data we have for each, but it would still be better to scale them the same way.

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How do you mean? They're different units and it is well documented (titles/legends, etc.) which should avoid confusion

If they're the same time scale you can easily compare what has changed over time. With different scales it's hard to match them up.

The graphs are independent and you can easily read each. What kind of comparisons do you want amongst them? Other than the 2 of them, the y axes of the graphs have different units.

On a phone they stack up vertically, in that setting it’s quite natural to want to have the time axis aligned too. It makes correlations stand out more.

I wonder why the chart for CO2 concentration starts at 1960 vs 1850 for the global mean temperature difference

Without knowing, my guess would be that's when we started measuring & recording those things?

That is the right answer.

The Mauna Loa daily CO2 measurements started in 1958. Before that, there weren't any continuous measurements happening.

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