Read all about it at ClimateProgress.
Climate is defined as the mean and variation of weather over long periods of time (typically, 30 years). I emphasize the “and variation” part because climate change doesn’t just refer to a changes in the mean, it also refers to changes in the variation.
One aspect of that change in variation is highlighted in a new paper (Seneviratne et al. 2014, Nature Climate Change, 4, 161-163) which points out that although global average temperature may have been increasing more slowly recently than in the previous two decades or so, the frequency of hot days in land areas has been increasing faster recently than in the previous two decades or so.
Here’s what some politicians have to say:
Here’s the opinion of Dr. Ralph J. Cicerone, President of the National Academy of Sciences, and Sir Paul Nurse, President of the Royal Society:
CLIMATE CHANGE IS ONE OF THE DEFINING ISSUES OF OUR TIME. It is now more certain than ever, based on many lines of evidence, that humans are changing Earth’s climate.
Who you gonna believe?
I got a request for a revised form of some graphics. I do not intend to turn into everybody’s graphics monkey, so if you make a request don’t expect it to be fulfilled. But, this one seemed important enough to be worth doing. The data are from Cowtan & Way, their revision to the HadCRUT4 global average surface temperature. Feel free to use them.
What’s the present trend in global surface air temperature? Good question.
Some of you might remember that when talking to an atheist, Faux News’ Bill O’Reilly said “Tide comes in, tide goes out, you can’t explain it.” Of the ridicule he received for that, my favorite was from none other than Neil Degrasse Tyson, who simply retorted, “I can explain it.” He can. O’Reilly is the one who can’t.
Apparently, O’Reilly now wants to dispute that global warming is caused by humans. Poor Bill … in spite of having decided to push that idea he doesn’t seem to have actual evidence. He, and his staff, don’t even seem to know what are the “best arguments” to support it.
A recent post at RealClimate by Matthew England discusses the results of his (and others’) recent paper (England et al. 2014, Recent intensification of wind-driven circulation in the Pacific and the ongoing warming hiatus, Nature Climate Change, doi:10.1038/nclimate2106) about changes in wind patterns in the tropical Pacific, their impact on ocean circulation, and the resulting impact on global temperature.