What Is a Paleoclimatologist?

A paleoclimatologist is a scientist who studies Earth’s ancient climates. The word “paleo” means “old,” and “climatologist” refers to someone who studies climate. So, a paleoclimatologist looks at what the climate was like thousands—or even millions—of years ago.

But how can scientists learn about climates from the past? Paleoclimatologists don’t use weather records like we do today. Instead, they use clues from nature, called climate proxies. These clues include ice cores, tree rings, fossils, corals, and even sediment layers from the bottoms of lakes and oceans. For example, the thickness of a tree ring can show if a year was wet or dry. Bubbles trapped in ice can tell us how much carbon dioxide (CO₂) was in the air thousands of years ago.

Studying ancient climates helps scientists understand how Earth’s climate has changed over time. They’ve discovered that the planet has gone through ice ages, warm periods, and many natural cycles. By comparing the past with today’s climate, paleoclimatologists can better understand how human activities, like burning fossil fuels, are now causing faster and more intense warming.

Paleoclimatologists work with other scientists, including geologists, biologists, and atmospheric scientists, to build a full picture of Earth’s climate history. Their research helps improve climate models and predict what might happen in the future.

Understanding Earth’s past helps us prepare for the future. Paleoclimatologists remind us that while climate change has always happened, today’s changes are happening at a much faster rate—and we need to take action.

Fun Fact: The oldest ice core ever drilled is over 800,000 years old, and it still holds tiny bubbles of ancient air!