Note the date, and that another 18 months has now passed with the same flat trend further strengthening this valid argument.
If you look at the record of global temperature data, you will find that the late 20th Century period of global warming actually lasted about 20 years, from the late 1970s to the late 1990s. Before that, the globe was dominated by about 30 years of global cooling, giving rise in the 1970s to media discussions of the return of the Little Ice Age (circa 1450 to 1850), or worse.
But the record of satellite measurements of global atmospheric temperatures now shows no warming for at least 17 years and 5 months, from September, 1996 to January, 2014, as shown on the accompanying graphic. That is surely 17 years and 6 months now, accounting for February.
When the period of no global warming began, the alarmist global warming establishment responded that even several years of temperature data does not establish a climate trend. That takes much longer. But when the period of no global warming gets longer than the period of actual global warming, what is the climate trend then?