Anne Hope Jahren (born September 27, 1969) is an American geochemist and geobiologist at the University of Oslo in Norway, known for her work using stable isotope analysis to analyze fossil forests dating to the Eocene.

[5] At Georgia Tech, she conducted research on paleoatmospheres using fossilized plants, and discovered the second methane hydrate release event that occurred 117 million years ago.

She and her collaborators analyzed depletion of oxygen isotopes to determine the weather patterns there that allowed large Metasequoia forests to flourish during the Eocene.

Jahren and colleagues suggest that experiments lacking control over factors like water availability may lead to misleading conclusions regarding CO2's direct influence on plants.

The study highlights the intricate interplay between atmospheric CO2, plant biology, and carbon isotopes, providing valuable insights into both modern and ancient ecosystems.

[11] On September 1, 2016, Jahren became the J. Tuzo Wilson Professor at the University of Oslo's Centre for Earth Evolution and Dynamics, where she studies how living and fossil organisms are chemically linked to the environment.

Subsequently, Jahren encouraged fellow scientists, specifically girls, to tweet pictures of their hands conducting scientific experiments.

She recommends that people draw strong professional boundaries, and that they carefully document what occurs, beginning with the first occasion of harassment.