In early December, Ted Cruz in a Senate hearing produced a chart which he claimed showed that global temperatures have not risen one iota in the last 18 years. It is a line graph showing the average annual temperatures over those years.
Imposed on the graph is a large, straight arrow which points from the earliest year to the last year on the line graph. Cruz says this arrow proves there has been no temperature change. That is such a mistaken claim that it is very difficult to believe he is being honest.
If one were to plot any series of points on a chart and then indicate the average of those points, of course the arrow would be a straight line going directly from one side of the chart to the other. What else could such an arrow do, since it measures only one thing: the average of the whole.
If one looks at the line graph and ignores the arrow, the picture is quite different. We notice, for instance, that the unusually high 1998 El Nino effect skews the graph. If it were a 17 year graph rather than 18, the rise in temperature is obvious. Or if Cruz had chosen just the last five years, the warming would have been pretty drastic.
Such a deceptive use of statistics is beneath the United States Senate and most certainly beneath the office of President which Cruz seeks. He is a deeply dishonest man.