IPCC

The Intergovernmental Panel on Climate Change

A political organisation?

Michael Mann’s Hockey Stick

What the temperature in Europe was really like during the past 1100 years

Carbon dioxide increases follow temperature increases

20,000 years ago

Sahul

An interstadial, warmerAn interstadial

7,000-8,000 years ago

Changes in ice volume over the past 750,000 years. G indicates when ice sheets have reached mid-western USA. (from O2 isotopes in plankton shells). The same in Europe.

Axial tilt. Period 41,000 yearsOrbital shape. Period 413,000 yearsPrecession. Period 26,000 yearsActivity of the sun (11 year cycle)Orbital inclination. Period 70,000 years

The cause of the seasons

Axial tilt. Period 41,000 yearsOrbital shape. Period 413,000 yearsPrecession. Period 26,000 yearsActivity of the sun (11 year cycle)Orbital inclination. Period 70,000 years