Some 40 heads of state plan to attend a U.N. meeting in December in Copenhagen meant to agree a global warming deal, the U.N. climate chief said on Friday.
Ice cores are important tools to identify Earth’s past climate. They enable us to peer back in time to identify species of insects trapped in ice as well as isotopes oxygen and dust particles that were deposited at various time in the past. The ratio of oxygen isotopes in the ice allows researchers to determine whether temperatures were warmer or cooler when the snow that eventually turned to ice was deposited on the glacier. The dust content gives scientists clues about the rate of precipitation at the site. The thicker the core (longer cores) the longer into the past we can see.
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