Narrator:This is Science Today. New instruments that drill deep into the ice of Antarctica use reflected light to detect dust particles. The dust gives scientists clues about changes in the Earth's temperature. Physicist Buford Price of the University of California, Berkeley says the amount of dust varies with the climate.
Price: When the Earth is very cold during an ice age, such as the one that wiped out the hairy mammoths, the winds are howling and sweeping up dust particles as much as a hundred times more dust than you find during the present, mild period.
Narrator: Price says the dust can show that the Earth's temperature has changed by as much as twenty or thirty degrees in just one decade.
Price: That is something that is of great interest to all humans now-are we likely in the next decade or so to find the Earth's temperature suddenly increasing or decreasing by that much?
Narrator: For Science Today, I'm Larissa Branin.