She then travelled to the United Kingdom where she studied a Bachelor of Arts, majoring in international relations, at the University of Sussex, graduating with Honours.

After completing her degree, Putt travelled back to Australia through Asia, and in 1975 got a job developing pollution control programs at Botany, at a time when the NSW Environment Protection Agency had just been set up.

[2] In 1992, Bob Brown asked Peg to be a support candidate for the Green Independents at the impending state election after the first Labor-Green accord collapsed.

Putt entered the Tasmanian House of Assembly in 1993 after Bob Brown resigned and votes in the Hobart electorate of Denison were recounted.

After her resignation, Putt left the state and has since returned to focus on international work, representing the Wilderness Society at UN climate change and forest negotiations.