Such old trees growing in marginal environments like the rocky cliffs are valuable records of the past environment. Their annual growth is constrained by twmpe

Such old trees growing in marginal environments like the rocky cliffs are valuable records of the past environment. Their annual growth is constrained by twmperature and rainfall. By measuring the rings produced in past years, we get information about the temperature and rainfall at those times. Since tree rings are annual, this gives climate data resolved to exact past years. For regions and times with no written records, this is one of the key sources to reconstruct past climate details.