In a thread titled something like "More Good News on the Global Temperature Front", a conservative talking point was brought up that now appears to be widely accepted. It's that global temperatures haven't risen for the last 15 years. In that thread, the following NCDC site was given as evidence:
Climate at a Glance | National Climatic Data Center (NCDC)
Visually, the chart that is shown certainly seems to have risen in the last 15 years but all doubt is removed if you select years 1999 - 2014 and click the 'Display Trend' button.
So where did this erroneous notion come from that temperatures haven't risen in 15 years?
Without the trend line, and I am not sure how they trend it, it is not obvious that the temperature has increased or decreased that just isn't true. 2000 and 2001 were obviously the real outliers on the chart they raise the slope of the line. Do a run from 2002 to 2014 and look at the trend a straight line. So OK there was slight warming, with 2001 and 2000 thrown in but since 2002 there certainly has not been any warming or cooling. I think the fact that the numbers are better, been taken longer and the fudged factors have been in place for 10 or so years has level out the temperature data. (don't forget to change both dates or you get the same trend.)
2001 wasn't an outlier. In fact, its the exact same temperatures as 2003, which you insist we include. Nor was 2000 an outlier. As we saw something similar in 2004 and 2008, both of which you insist we include. You're omitting them 'just because'.
And if the question is 'has the temperature gone up in the last 15 years', I'd go back 15 years and check. And we have an ascending trendline. Even if we inexplicably lop off 2000 and 2001 'just because', we still have an ascending trendline.
Look at them in 5 year chunks and it gets even more stark. From 1999, 2000, 2001, 2002 and 2003, the average was 0.54. For 2010, 2011, 2012, 2013, and 2014, the average is 0.67.
A nearly 25% increase in land and sea temperature anomalies. But the temperature is flat, huh?
Go back to say, 1990, and it gets even more stark. 1990, 1991, 1992, 1993, and 1994, the average is 0.35.
That's an astonishing 91% increase in land and sea anomalies.
Go back to 1980, and wow. 1980, 1981, 1982, 1983, and 1984.....and the average anomoly is 0.26.
With our last 5 year average about 2 and half times higher.
There's a reason why 97% of publishing earth scientists are on one side of this issue; the evidence is pretty damn clear.
Oh, and if you hear a 'skeptic' tell you that our temperature has been flat since 1998, what they *actually* mean is that we had a temperature spike in 1998, going from .035 in 1995 to 0.39 in 1996 to 0.43 in 1997,
to a whopping 0.67 in 1998, back down to a 0.41 in 1999.
1998 was an outlier. And a pretty stark one. It was the largest anomoly we'd ever recorded. Here's the scary part:
The temperature has increased so much, that our 5 year AVERAGE from 2010 to 2014 is now at almost exactly at the same place now the 'largest anomoly ever recorded' in 1998. 0.72 in 2010, 0.54 in 2011, 0.68 in 2012, 0.66 in 2013 and 0.74 so far in 2014.
Which the 'skeptics' know perfectly well. But really hope you don't.