And still the right wing douchebags do not understand. These incursions of cold air are due to climate change. Specifically a weakening of the polar vortex. How many times do I have to post the same information before in sinks in.
Here's some news for people on all sides of the climate change debate: Winters still get cold, often unbearably cold, especially if you live in a place like
Crane Lake, Minn., which hit 38 below zero this week.
But no matter how low the temperature dropped in your area today, that doesn't mean global warming isn't happening.
So as Americans debate whether a warming planet can still have punishing winters and try to figure out what a "polar vortex" is – with everyone from Rush Limbaugh to the Drudge Report and a few other commentators talking about it – we'd like to add a dose of science to the conversation.
Let's look at the claims skeptics are making one by one:
1) "Polar vortex" is a concept "created to make you think winter is caused by global warming."
Yesterday on his radio program and website, Rush Limbaugh
called a "hoax" the claim that global warming was causing the cold weather snap, and that the media had invented the term "polar vortex" to explain it all away.
Actually, the term "polar vortex" is not a new one. It's used by meteorologists to describe a pattern of winds that swirl around the North Pole, as Weather Underground's Dr. Jeff Masters describes it in a
blog post today:
"In the winter, the 24-hour darkness over the snow and ice-covered polar regions allows a huge dome of cold air to form. This cold air increases the difference in temperature between the pole and the Equator, and leads to an intensification of the strong upper-level winds of the jet stream. The strong jet stream winds act to isolate the polar regions from intrusions of warmer air,
creating a 'polar vortex' of frigid counter-clockwise swirling air over the Arctic."
For a historical perspective,
here's an article from the August 1950 issue of the scientific journal Tellus, describing a lab experiment that replicated the effects of the polar vortex.
2) Winters as cold as this one prove that global warming isn't real.
On Monday, U.S. Sen. James Inhofe (R-Okla.) appeared on the floor of the U.S. Senate and said this:
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We include this example not to pick on Inhofe, but to share one of the latest and highest-profile examples of claims about global warming and climate change that have spread around the mainstream national media in recent years.
In the video, Inhofe cites several examples of frigid cold and winter snowstorms from recent years, including one that he says "snowed out" a planned rally on global warming that was to be led by U.S. Rep. Nancy Pelosi (D-Calif.) in March 2009.
No scientist argues that long-term global warming means that we won't still experience winter, even bitterly cold winters like this year's has become. The changes to the climate that scientists who are concerned about global warming point out are exactly that: long-term. Individual weather events don't mean that the trend isn't taking place.
(It's also important to point out that the United States makes up less than 2 percent of the Earth's surface. So even when we see heavy snow events and blasts of Arctic air like this week's, there are many parts of the world experiencing record heat, such as
Australia.)
4) The planet hasn't warmed for the past 15 years, so climate change isn't real.
Technically, this isn't really true. Though surface temperatures haven't gone up by as much as climate models predicted they would by now, they've still been rising slightly throughout the decade.
Starting with its first report in 1990,
the Intergovernmental Panel on Climate Change projected that the planet would warm by about 0.15 to 0.3°C per decade, if greenhouse gas emissions into the atmosphere continued at their current pace.
That projection held true for years until about 1998, one of the planet's hottest years on record. Since then, despite ever-increasing emissions, global temperatures have risen by only about 0.05°C per decade.
Why this is happening is something climate scientists still are trying to figure out. Many point to the world's
oceans, which are absorbing most of the increase in both heat and carbon dioxide, while others note that our most-cited historical temperature observation records
leave out large parts of the planet, including the poles.
Still, it's undeniable that a long-term warming trend remains in place, as this temperature trend map from 1960 to 2013 shows:
NASA/GISS
Trends in mean surface air temperature from 1960 to 2013. Notice that the Arctic is red, indicating that the trend over this 50-year period is for an increase in air temperature of more than 2°C (3.6°F) across much of the Arctic, a larger increase than in other parts of the globe.
As the map above shows, warming doesn't occur at the same rate worldwide. Some places, like the tropics, have warmed at a much slower pace than the higher latitudes, where warming has been most pronounced.
And the world hasn't stopped experiencing dramatic warming: the past decade has been one of
"unprecedented" climate extremes according to the World Meteorological Organization, while 2013 brought the
world's hottest November in more than 130 years of record-keeping, and 2012 was the
hottest year on record for the U.S.
If global warming is indeed on "pause," we can only hope it doesn't resume.
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