Radio Wales ‘Science Café’ recently included an interview with Professor Danny McCarroll, from the Department of Geography, about the use of tree rings to reconstruct past climate. Danny and his team specialise in using the chemistry of tree rings to reconstruct past changes in temperature, cloudiness and moisture availability and they also investigate the way that trees influence and respond to the amount of carbon dioxide in the air. They use trees from many different environments, from the Arctic to the tropics, and even a few from Wales.