A few points from Cato Institute’s Patrick J. Michaels, who writes in The Wall Street Journal:

Until last June, most scientists acknowledged that warming reached a peak in the late 1990s, and since then had plateaued in a “hiatus.” There are about 60 different explanations for this in the refereed literature.

That changed last summer, when the National Oceanic and Atmospheric Administration (NOAA) decided to overhaul its data, throwing out satellite-sensed sea-surface temperatures since the late 1970s and instead relying on, among other sources, readings taken from the cooling-water-intake tubes of oceangoing vessels. The scientific literature is replete with articles about the large measurement errors that accrue in this data owing to the fact that a ship’s infrastructure conducts heat, absorbs a tremendous amount of the sun’s energy, and vessels’ intake tubes are at different ocean depths. …

NOAA’s alteration of its measurement standard and other changes produced a result that could have been predicted: a marginally significant warming trend in the data over the past several years, erasing the temperature plateau that vexed climate alarmists have found difficult to explain. Yet the increase remains far below what had been expected.

It is nonetheless true that 2015 shows the highest average surface temperature in the 160-year global history since reliable records started being available, with or without the “hiatus.” But that is also not very surprising. Early in 2015, a massive El Niño broke out. … What happened this year also happened with the last big one, in 1998.

The notion that world-wide weather is becoming more extreme is just that: a notion, or a testable hypothesis. As data from the world’s biggest reinsurer, Munich Re, and University of Colorado environmental-studies professor Roger Pielke Jr. have shown, weather-related losses haven’t increased at all over the past quarter-century. In fact, the trend, while not statistically significant, is downward. Last year showed the second-smallest weather-related loss of Global World Productivity, or GWP, in the entire record.

Without El Niño, temperatures in 2015 would have been typical of the post-1998 regime. And, even with El Niño, the effect those temperatures had on the global economy was de minimis.

On a related note, The Daily Caller’s Michael Bastasch last March reported, “The Intergovernmental Panel on Climate Change itself says there’s ‘limited evidence of changes in extremes associated with other climate variables since the mid-20th century.’” He added, “Not only has weather not been getting more ‘extreme’ in the last century, mankind’s ability to withstand extreme weather events has increased globally. The International Disaster Database reports that more than 3.5 million people were killed by natural disasters in the early 1930s when the world population was about half what it is today. Fast forward to 2014 and only 7,700 people worldwide were killed by natural disasters (which includes earthquakes), according to Munich Re.”