SFSU- GEOGRAPHY 316:
BIOGEOGRAPHY (B. Holzman, PhD)
updated:  11/18/02

Climate Change

I. Climate Change

       Direct Evidence

       Historical data

       Proxy data

II. Proxy data

       Oceanic and Lake sediments

       Pollen

       Dendrochronology

       Pack rats

III Climate changes over time

       Past 100 years

       Past 1000 years

       Past 25,000 years

       Past 150K years

       Past million years

IV. Reasons for change (hypotheses)
       Milankovich Cycle (orbit)

       Axial tilt

       Earth wobble

V. Summary