00:00Here at the U.S. National Ice Core Lab in Antarctica, scientists drill and retrieve ice cores to learn about how our climate has changed over thousands of years.
00:14It was here in Antarctica in 1988 that a joint U.S.-Russian team of scientists took ice core samples throughout the depth of the East Antarctic ice shelf.
00:27At a depth of over 4 kilometers, it's the deepest known ice pack on the planet.
00:32Each year's snowfall and dust deposits trap bubbles of air in the ice, providing an accurate record of climate conditions going back over 800,000 years.
00:47What the data shows was a repeating cycle of approximately 100,000 years where the climate went from warming to cooling.
00:57As CO2 naturally increased in the atmosphere, the climate warmed.
01:02And then as CO2 was gradually absorbed, the temperature cooled.
01:08the conclusion of 8 years is what they thought of itself.
01:10Which can be transformed into crucial sanctions shortly after system change is the Vertical MARK.
01:15To be continued by Dan Latimerick.
01:21ilit unibernsie and mercado.
01:26Fire by Dan unstable swing.
01:28To be continued by Dan the river's newsroom.
01:32Even the limited year at the U.S. Chinese, he was providing handily audio power supply,
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