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White house
has published an infographics about Climate Change,
and it has released a 2 minutes
video for explaining the "Polar Vortex".
Obama's Science adviser ask people Not to believe the arguments
which say that the recent Polar vortex of cold weather
disproves global warming.
Some Republican commentators
and lawmakers have raised questions about the
truthfulness of global warming amid the bitter blast of
cold temperatures that rocked most of the U.S.
if you've been hearing
that extreme cold spells like the one that we're having in the united states
now
disprove global warming don't believe it
the fact is that no single weather episode can either prove or disprove
global climate change. Climate is
the pattern of weather that we observe
geographically and over the season's and it's described in terms of averages
variations and probabilities. But a growing body of evidence suggest that
the kind of extreme cold being experienced by much of the United States
as we speak
he is a pattern that we can expect to see with
increasing frequency as global warming continues and the reason
is this. In the warming world that we're experiencing
the far north Arctic is warming roughly twice as rapidly
as the mid-latitudes such as the United States
I'll that means that the temperature difference between the Arctic
in the mid-latitudes is shrinking and that temperature difference
is what drives what is called the circumpolar vortex
which is the great counter-clockwise swirl in massive call their
that hovers over the yard as the temperature difference between the
Arctic in the mid-latitudes declines
the polar vortex weakens and it becomes
way the year the waviness means
that there can be increased larger
excursions of cold air southward that is into the mid-latitudes and in the other
phase in the wave
increased excursions are relatively warmer mid-latitude air
into the far northern computer models tell us that there are many different
factors influencing these patterns
and as in all science there will be continuing debate
about exactly what is happening but I believe the odds are that we can expect
as a result global warming to see more of this pattern
a extreme cold in the mid-latitudes
and cement