Proxy data--indirect records of the Earth's climate found in unlikely places like coral, pollen, trees and sediments--show interesting oscillations approximately every 100,000 years starting about one million years ago. Strong changes in global ice volume, sea level, carbon dioxide concentration, and surface temperature indicate cycles of a long, slow transition to a glacial period and an abrupt switch to a warm and short interglacial period.
Proxy data--indirect records of the Earth's climate found in unlikely places like coral, pollen, trees and sediments--show interesting oscillations approximately every 100,000 years starting about one million years ago. Strong changes in global ice volume, sea level, carbon dioxide concentration, and surface temperature indicate cycles of a long, slow transition to a glacial period and an abrupt switch to a warm and short interglacial period.
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