Tree rings
What can chunks of old wood tell scientists about historical climate change?
If you've ever seen a tree stump you'll have noticed the growth rings - new wood added around the trunk each year in the growing season.
Each tree's rings provide a year-by-year climate record, because their thickness is affected by the weather. Dendrochronologist Keith Briffa tells antenna more.
| 
Tree rings give a yearly climate record
Image: Paul James |
|
