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Changing, changing faster than the science and the studies can keep up with. the team drilled through the ice to measure thickness. >> we're starting to get a fairly good idea. it has definitely thinned in this area as well, basically thinned everywhere. >> reporter: extracting ice that holds frozen clues. >> wow. look at this. beautiful. >> about a meter of ice core here. inside this piece of ice is a microscopic forest. >> reporter: greenpeace ship "the arctic sunrise" is converted into a floating lab. >> all right. grab the first one. melted ice core samples come to life, a kaleidoscope of ...

Together a puzzle. these pieces are constantly changing. changing faster than the science and the studies can keep up with. >> reporter: the team drove through the ice to measure thickness. >> we're starting to get a pretty good idea. it has definitely thinned in this area as well. it's basically thinned everywhere. >> reporter: extracting ice cores that hold frozen clues. >> beautiful. about a meter of ice core right here. and inside this piece of ice, is a little microscopic forest. >> reporter: greenpeace arctic sunrise, is converted into a floating lab. >> can you grab the first one? >> re...

To measure thickness. >> it has definitely thinned in this area as well. it's basically thinned everywhere. >> extracting ice cores that hold frozen clues. >> wow, look at this. beautiful. that's about a meter of ice core here. inside is a microscopic foreign. >> greenpeace "arctic sunrise" is converted into a floating lab. all right. can grab the first one. >> reporter: melted ice core samples come to life. a kaleidoscope of algae and phytoplankt phytoplankton. >> they're tremendously important for carbon drawdown. they takes in the carbon dioxide. >> reporter: phytoplankton just

Question. has the arctic reached a tipping point? engineer zoe korville has explained its isolation is its greatest asset. >> it's a pristine of climate change specifically. >> we've been making measurements since 1980 here. we've also drilled to bedrock. so we have -- >> 140,000 years? >> yes, we're standing on two miles of ice below us. and you can use ice core as tree rings to get an idea of what it was like. >> but summit's hefty price tag has made it a pro po sal for

Bedrock. so we have an ice core that extends back 140,000 years. and so -- >> 140,000 years? >> yes. 140,000. so we're actually standing on two miles' worth of ice below us. and we can use the ice cores like you would use tree rings, to get an idea of what past conditions of climate were like. and we can use what happened in the past to try to predict what's going to happen in the future. >> reporter: but summit's hefty price tag has made it a possible target for proposed budget cuts. the trump administration wants to slash funding to the national science foundation, and many fear that summit ...