A discussion of the methods for determining the ages of ancient ice cores. (myintimcity.com)
Ancient ice core samples show that temperature changes and CO2 levels are not correlated. (mysanantonio.com)
To work out how long - term climate variability changed over the period, the researchers analysed data taken from ancient ice cores, marine sediments and animal and plant fossils stretching back thousands of years. (carbonbrief.org)