Since 2019 Tamar is focusing solely on combating climate change. In particular, Tamar is directing research aiming to reduce the impact of computing on the environment. This includes making computation more energy and carbon efficient, as well as addressing the manufacturing carbon cost.

Tamar Eilam is known for pioneering the concept of a "desired state based deployment and management". This principle centers around the idea of separating the "what" and the "how" in complex application deployments. A semantic description of a topology including software components, services, and infrastructure requirements is linked with automation to produce and converge to the desired state from the current state. This was the basis for a successful family of products known as "Patterns of Expertise".