Here's the "best" set of temperature data that I know about ... Summarized here.

The conclusion of the research (sponsored in part by the Koch foundation) is that there appears to be a human component in the warming trend of the last 50 yrs above a general warming trend over the last 250 yrs.

It's true that warming trends much larger have been part of the natural earth's history but the recent data do allow for some conclusions to be made. Also, year to year variations can be much larger than any such trends.

Now policy decisions are another matter - hopefully they are guided by science and not hype and hysteria.