Greenhouse Gas emiss

E

@xmeld t-geos210 E

Tree rings

@xmeld t-geos210 3 million years because there is a climatic cycle

3 million years, because they occur in climatic cycles

Ice ages occur in cycles

80,000 years

C

@xmeld t-geos210 B

B

A 1

B 2

A

@xmeld t-geos210 B

B