Colder winters in Iowa actually prove that global warming is a realit…

The No. 1 argument climate-change deniers use to “prove” that global warming is not happening is the fact that there have numerous examples of historically low winter temperatures in the United States in recent years. How can our planet be warming if the winter temperatures are falling? Read on.

This past January, the lows at Okoboji included -17 on Jan. 13 and 14; then -21 a week later.  The windchills were stunning. Unfortunately, the numbers do not appear to have been preserved in a readily accessible way.

In Des Moines, however, the windchill hit -36 on the night of the Iowa caucuses. It was the coldest weather ever recorded for a caucus night by a wide margin.

Across the Upper Midwest, it was one of the coldest weeks ever recorded with temperatures not suited for human exposure.

Mary Skopec, the executive director of the Iowa Lakeside Laboratory and one of the state’s leading environmental scientists, said these temperatures actually…