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one of the key variables that we at nasa

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have been studying with satellite data

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is sea ice in the polar regions

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sea ice is a really important component

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of the polar regions does things like

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insulates between the ocean the

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atmosphere reflects solar radiation

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extends over a very large area in both

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the polar regions and so it has an

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impact has an impact that propagates

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sometimes to lower latitudes also

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so we want to study this and the only

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way really to study it effectively on

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the large scale is with satellite data

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which gives us a beautiful view of both

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north polar and south polar region so

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we've been doing that and we've been

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doing it for 30 years and we've been

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finding that in the arctic case that

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arctic sea ice has actually decreased

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quite a bit

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over that time span of about 30 years

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whereas the antarctic has not the

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antarctic has been increasing

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this is a puzzle that many of us are

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interested in solving and it also the

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arctic case fits in really well with

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global warming and has

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many people interested because of how it