An introduction to the use of tree rings, ice cores and glacial activity as evidence of climate change. Two main pieces of evidence for climate change are discussed; the effects of temperature on tree ring widths over the short term and ice cores as evidence of longer term fluctuations. It suggests continental drift has a part to play over the longest time scales.

First broadcast:
18 October 2007

Can be used to discuss climate change and earth movements (plate tectonics). Discuss how tree rings can be used to show variations in tree growth. How do tree rings vary with temperature? Why is this so? Discuss how ice cores can also be used to discuss climate change. Explain how surface land masses are formed. Briefly explain the concept of continental drift.