Explanation:

- Dendroclimatology is indeed the study of past climates using tree rings. Researchers analyze tree growth characteristics to infer climatic conditions during different periods.

- Bioclimatology focuses on the interactions between living organisms and climate. It considers how climate affects the distribution and function of life on Earth.

- Historical climatology reconstructs past climates by analyzing historical records, documents, and artifacts. It looks at human archives to understand past climate conditions.

- Geo climatology examines climate systems in relation to the Earth's geological processes and structures, but it’s not a commonly used term compared to the others.

Answer: Dendroclimatology is concerned with constructing records of past climates by analyzing tree growth characteristics, especially growth rings.