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Y'know, I've seen a lot of inane and poorly devised arguments here. This has got to rank with the worst of them.
The United States is not the entire planet. In fact, the surface area of the continental United States is 1.58% of the planet. Temperatures in the US are not in lock step with the entire planet. And when you look at the raw data, there is STILL a clear trend of rising temperatures.
This is a chart of both raw and adjusted GLOBAL temperatures. We are, after all, talking about GLOBAL warming:
Back in the real world: Every dataset of global averages makes adjustments these days. Scientists have done this for decades. It's all public. Anyone with a basic familiarity with the science knows about them, and why they're made. Note the adjustments overall are quite small, particularly after 1940; and of course, the adjustments before 1940 actually revised temperatures up. This is no different than calibrating a telescope or mass spectrometer.
In a move that is equal parts hilarious and sad, the deniers will complain when the data is adjusted -- and complain when it ISN'T adjusted. If it's adjusted to compensate for urban encroachment on measuring stations, then it's a fix! If it isn't adjusted, then they're allowing an artificial bias and... it's fixed!
I mean, really. Your idea of a "scam" is scientists who publish the raw data, the adjusted data, and the actual scripts you can use to adjust the data yourself? Whose adjustments show less warming in the past, and almost no adjustments now?
Those types of arguments are not rational, they're not scientific. That's just straight-up denial.
Please see the link in #12.