millennial climate variation

Millennial climate variation refers to changes in Earth's climate over periods of thousands of years. These variations are superimposed on longer-term trends and are influenced by factors such as changes in Earth's orbit (Milankovitch cycles).12

During the Holocene Epoch, which began about 11,700 years ago, Earth experienced significant climatic shifts. For instance, many regions saw thermal maxima (periods of higher temperatures) in the early to mid-Holocene, though these varied geographically. Simultaneously, some areas experienced increased cooling and moisture, while others became warmer and drier. These changes in temperature and moisture patterns are attributed to shifts in atmospheric circulation and ocean currents.13

Paleoclimatologists study these past climate changes using proxy records from sources like ice cores, tree rings, and sediments to understand the mechanisms driving climate variation. These long-term variations have profoundly impacted human societies, sometimes influencing cultural development and, in other instances, contributing to societal collapse.41