GLOBAL CHANGES

• SNOWBALL EARTH http://en.wikipedia.org/wiki/Snowball_earth
• ICE AGES http://en.wikipedia.org/wiki/Ice_ages
• ABRUPT CHANGES HEINRICH EVENTS http://en.wikipedia.org/wiki/Heinrich_events

DANSGAARD OESCHGAR EVENTS http://en.wikipedia.org/wiki/Dansgaard-Oeschger_event

YOUNGER DRYAS http://en.wikipedia.org/wiki/Younger_Dryas