As Senior Fellow with Climate Solutions, Duncan helped develop our efforts to shift the Northwest to 100% clean energy. He was previously Director of International Climate Policy with The Nature Conservancy, where he coordinated international policy work on issues such as reducing emissions from deforestation, adaptation and climate finance. He led TNC's engagement in international forums such as the UN Framework Convention on Climate Change and the Forest Carbon Partnership Facility.  He is a former US climate change negotiator, serving the US State Department from 1997 to 2001. He worked on the Kyoto protocol, the predecessor to the Paris climate agreement.